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Home Engineering Control Engineering

Basic of Control Theory: Session 12 – Cutting the Cord – Wireless Control and the Road Ahead

by ahmedneaz
August 3, 2025
in Control Engineering, DIY Electronics & Robotics
25
Basic of Control-session 12

Basic of Control-session 12

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Hello and welcome, for one last time, to our series on the secret brains of everything. Over the past eleven sessions, we have embarked on an incredible journey. We started with a simple idea—balancing a broom—and built our way up, concept by concept, line by line, to a fully functional mecanum robot. It has a body, a brain, and a rulebook. It can execute pre-programmed commands with precision, thanks to the tireless work of four independent, finely-tuned PID controllers.

Our robot is smart. It’s capable. But it’s still tethered to the code we upload. The final step in our capstone project is to cut that last cord and give our creation the gift of real-time, interactive freedom.

Today, we are adding wireless remote control. We’ll explore the options, implement a simple and robust solution, and finally, take our robot for its first human-piloted test drive. Then, we’ll look to the future and all the amazing places you can go from here.

Choosing Your Communication Channel

To control our robot wirelessly, we need to establish a communication link between a controller and the robot’s Arduino brain. This is done using a communication protocol, a set of rules that allows two devices to understand each other.1 For robotics, there are several popular wireless options, each with its own strengths 2:

  • Wi-Fi: Offers high speed and good range by connecting to a local network. This is a great choice for more advanced projects, especially if you want to stream video from a camera on the robot. Microcontrollers like the ESP32 have Wi-Fi built-in, making them perfect for this.3
  • Dedicated Radio Control (RC): Modules like the NRF24L01 or classic hobbyist RC transmitters offer very low latency, making them ideal for high-speed, performance-oriented driving where every millisecond of delay matters.5
  • Bluetooth: This is the undisputed champion for beginner-friendly, short-range communication. It’s low-power, easy to set up, and allows you to control your robot directly from the device you already own: your smartphone.1

For our final project, we’ll focus on the most accessible and versatile option: Bluetooth.

Implementation: Smartphone Control with the HC-05

We will use the popular and inexpensive HC-05 Bluetooth module to create a serial data link between a smartphone app and our robot.6

Step 1: Wiring the HC-05 Module

First, disconnect the power from your robot. We need to add the HC-05 module to our existing circuit. It’s a simple four-wire connection to our Arduino Mega 7:

  • VCC on HC-05 → 5V on Arduino Mega
  • GND on HC-05 → GND on Arduino Mega
  • TXD on HC-05 → RX1 (Pin 19) on Arduino Mega
  • RXD on HC-05 → TX1 (Pin 18) on Arduino Mega

Why use pins 18 and 19? The Arduino Mega has multiple hardware serial ports. The main one (Serial, on pins 0 and 1) is used for uploading code and communicating with your computer via USB. By using a secondary port (Serial1), we can talk to the Bluetooth module without ever having to disconnect it when we upload a new sketch.8

Step 2: The Communication Protocol

Our robot needs to understand the commands our phone sends. We will use a simple but effective character-based protocol.9 The smartphone app will send a single character, and the robot will interpret it as a specific command.

  • 'F' = Move Forward
  • 'B' = Move Backward
  • 'L' = Strafe Left
  • 'R' = Strafe Right
  • 'Q' = Diagonal Forward-Left
  • 'E' = Diagonal Forward-Right
  • 'Z' = Diagonal Backward-Left
  • 'C' = Diagonal Backward-Right
  • '<' = Rotate Counter-Clockwise
  • '>' = Rotate Clockwise
  • 'S' = Stop All Motion

This approach is simple to program and very reliable for basic control.10

Step 3: Modifying the Master Code

We’ll now modify our master code from Session 11. Instead of hard-coding the target_v... variables, we will read the incoming character from the Bluetooth module and update them in real-time.

The key changes are:

  1. Initialize Serial1 in setup() to listen to the Bluetooth module.
  2. In the loop(), constantly check if there is new data available from Serial1.
  3. If there is, read the character and use a switch statement to update the target speeds.

Here is the relevant code to add/modify in your sketch from Session 11:

C++

// In the setup() function, add this line:
void setup() {
  //... (all your other setup code)
  Serial1.begin(9600); // Start communication with HC-05 (default baud rate is often 9600)
}

// In the loop() function, BEFORE the 20ms timer check, add this block:
void loop() {
  // Check for an incoming command from the Bluetooth module
  if (Serial1.available() > 0) {
    char command = Serial1.read();

    // Set a base speed. You can adjust this value.
    float base_speed = 100.0; 

    switch (command) {
      case 'F': // Forward
        target_vy = base_speed; target_vx = 0; target_wz = 0;
        break;
      case 'B': // Backward
        target_vy = -base_speed; target_vx = 0; target_wz = 0;
        break;
      case 'L': // Strafe Left
        target_vy = 0; target_vx = base_speed; target_wz = 0;
        break;
      case 'R': // Strafe Right
        target_vy = 0; target_vx = -base_speed; target_wz = 0;
        break;
      case '<': // Rotate CCW
        target_vy = 0; target_vx = 0; target_wz = base_speed;
        break;
      case '>': // Rotate CW
        target_vy = 0; target_vx = 0; target_wz = -base_speed;
        break;
      case 'Q': // Diagonal Forward-Left
        target_vy = base_speed; target_vx = base_speed; target_wz = 0;
        break;
      case 'E': // Diagonal Forward-Right
        target_vy = base_speed; target_vx = -base_speed; target_wz = 0;
        break;
      case 'Z': // Diagonal Backward-Left
        target_vy = -base_speed; target_vx = base_speed; target_wz = 0;
        break;
      case 'C': // Diagonal Backward-Right
        target_vy = -base_speed; target_vx = -base_speed; target_wz = 0;
        break;
      case 'S': // Stop
        target_vy = 0; target_vx = 0; target_wz = 0;
        break;
    }
  }

  //... (the rest of your loop() function with the 20ms timer and PID calculations)
}

Step 4: Connecting with a Smartphone App

You don’t need to be an app developer to control your robot. There are many free apps on the Google Play Store (and the Apple App Store) that act as generic Bluetooth controllers.

  1. Download an App: Search for an app like “Arduino Bluetooth RC Car” or “Bluetooth Serial Controller”.11
  2. Pair Your Phone: Power up your robot. Go to your phone’s Bluetooth settings and scan for devices. You should see “HC-05”. Pair with it using the default password, which is usually “1234” or “0000”.6
  3. Configure the App: Open your chosen controller app. Connect to the paired HC-05 module. Most apps will have a settings menu where you can assign a character to each button. Configure the buttons to send the characters our code is expecting (e.g., the ‘Up Arrow’ button should send ‘F’, the ‘Stop’ button should send ‘S’, and so on).

Once configured, you’re ready. Press the buttons on your phone, and watch your robot glide across the floor at your command.

The Journey’s End, and a New Beginning

Take a moment to appreciate what you have accomplished. You have built, from scratch, a complex electromechanical system. You have implemented advanced control theory to give it a brain that can sense, think, and act with precision. You have bridged the physical and digital worlds, creating a machine that you can command from the palm of your hand.

You have completed the entire control systems pipeline.

This robot is now your platform. The journey of this series is over, but your journey as a robotics engineer is just beginning. Where do you go from here?

  • Add More Senses: Integrate ultrasonic sensors for automatic obstacle avoidance. Add a line-following sensor and program the robot to autonomously navigate a track.
  • Achieve True Trajectory Following: Use the encoder data for odometry—calculating the robot’s position over time. With this, you can program it to follow complex paths, like a square or a circle, all on its own.
  • Upgrade the Brain: Swap the Arduino Mega for an ESP32 to give your robot Wi-Fi capabilities, allowing you to control it from any computer on your network or even host a web-based controller.13
  • Give it Vision: Add an ESP32-CAM to stream live video and open the door to the world of computer vision and AI-powered control.15

Thank you for joining me on this adventure. You started with a question, and you’ve ended with a creation. You’ve learned the theory not just by reading, but by building. Keep tinkering, keep learning, and keep making. The world is full of systems waiting to be controlled. Now you know how.

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  19. lotto_sson says:
    2 weeks ago

    I have been using Lottoland for about four months, so the honeymoon phase is well behind me. Originally came for the lottery side, though the slots pulled me in too. The game library is surprisingly large, combining lotto draws with slots and table games.

    The casino side runs on games from Pragmatic Play, NetEnt, Evolution and Nolimit City. The top titles are easy to find, though the total count is lower than a standalone casino. The real draw is the lottery product: EuroMillions, PowerBall, MegaMillions and about forty others, and the jackpot sizes can be staggering. There are also scratch cards and instant win games.

    The sign-up deal at Lottoland depends on where you are: typically a discounted first bet on a lottery draw. Casino bonuses appear occasionally, though the lottery promos are more frequent. Latest offers and any active codes can be found at lottoland since they rotate regularly. Playthrough on the casino side is in the standard range.

    The deposit floor is friendly: one pound for lottery bets, ten for casino. Payment methods include cards, PayPal and prepaid options. Cashouts via e-wallet took under twenty-four hours, card payouts took a bit longer. Document check went smoothly — uploaded a driving licence and a bank statement, done in a few hours.

    The app is available on both iOS and Android, and it loads quickly. Lottery draws update in real time, with the casino accessible from the same app. Customer service responds on chat, replies come within a few minutes. Dual licensed, Gibraltar and UK, which gives proper regulatory backing. Overall a solid platform.

    Reply
  20. rever_xjSn says:
    2 weeks ago

    Been playing at Revery Play for roughly four months, enough time to see the patterns. A mate at work mentioned it, because my old one kept delaying withdrawals. The catalogue at Revery Play is decent, combining slots with a respectable live section.

    The games are supplied by Pragmatic Play, NetEnt, Play’n GO, Red Tiger and a few boutique studios. Sweet Bonanza and Gates of Olympus are front and centre, though I spend more time on the newer releases. Live casino is Evolution, so Lightning Roulette, Crazy Time, blackjack and baccarat. Tables are staffed day and night, but low stake tables get busy in the evening.

    The sign-up offer here is a 100 percent match up to 200 pounds with free spins. Wagering is 35x, not the worst but not a gift either. Active bonus terms are worth looking at on reveryplay since these change monthly. There are weekly reload offers.

    The floor is ten pounds. Cards and PayPal are accepted. E-wallet cashouts came through same day, bank transfers ran a couple of days. Identity verification went smoothly — uploaded ID and it was approved overnight.

    On the phone I play through the browser and performance is smooth. No app needed, which I prefer anyway. The chat team replies within minutes and wait times are short. Regulation is Curacao based, so not UKGC, which is worth knowing. Payouts have always come through for me.

    Reply
  21. playf_fvPt says:
    1 week ago

    Spiele jetzt seit ungefaehr einem halben Jahr bei Play Fortuna unterwegs, genug Zeit also um aus eigener Erfahrung berichten. Bin ueber einen Forenpost darauf gestossen, hauptsaechlich wegen der Spielauswahl.

    Das Angebot an Spielen hier geht in die Tausende: die ueblichen grossen Anbieter sind alle vertreten. Book of Dead und Starburst stehen ganz oben, die High-Volatility-Spiele sind fuer mich das Highlight. Evolution betreibt die Live-Tische: Roulette, Blackjack und Baccarat mit deutschen Dealern. Dealer sprechen Deutsch zu bestimmten Zeiten.

    Der Willkommensbonus bei Play Fortuna bietet eine Verdopplung bis 500 Euro, dazu Freispiele in Tagesraten. Umsatzbedingung ist 40x, streng aber branchenueblich. Gueltige Bonusbedingungen sind nachzulesen auf play fortuna am besten vorher checken. Reload-Boni gibt es woechentlich.

    Die Untergrenze liegt bei zehn Euro. Karten und E-Wallets funktionieren, Crypto geht auch. Skrill-Auszahlungen waren am naechsten Tag da, Auf die Karte waren es drei Werktage. Dokumente wurden schnell geprueft — ging beim ersten Versuch durch.

    Mobil spiele ich ueber den Browser, Performance ist gut. Kundenservice spricht Deutsch Wartezeit liegt bei drei bis fuenf Minuten. Es gilt eine Curacao-Lizenz, also keine deutsche GGL-Lizenz. Auszahlungen wurden nie verweigert.

    Reply
  22. rever_yrSn says:
    1 week ago

    Hab mich vor ein paar Monaten dort angemeldet, deswegen mal mein ehrlicher Senf dazu. Die Lobby bei Crypto Control ist ziemlich fett — irgendwas um die 3000 Titel, genaue Zahl wei? ich nicht. Play’n GO und Yggdrasil sind gut abgedeckt, ich hang meistens an Gates of Olympus oder Book of Dead fest.

    Die Begru?ungsaktion war offen gesagt der Ausloser, warum ich uberhaupt angefangen hab. matched deposit bis 500 Euro mit 200 Freispielen obendrauf, die Freispiele kommen portionsweise. Was man wissen sollte: die Umsatzbedingung liegt bei 35x, schaffbar, aber nichts fur nebenbei. 20 Gratisspins ohne Einzahlung waren auch drin, die Promos andern sich aber laufend.

    Die jeweils gultigen Angebote stehen bei [url=https://audienceplay.com/solana-casino-der-komplette-leitfaden-fur-deutsche-spieler/]solana casino[/url] — lohnt sich vor der Anmeldung kurz reinzulesen. Eingezahlt werden mussen mindestens 20€, Konto war fix erstellt.

    Was das Abheben angeht kann ich nicht meckern: per Krypto ging’s in unter zwei Stunden, mit E-Wallets rund 24 Stunden. Mit Visa oder Mastercard geht’s genauso, da wurde ich aber mit zwei bis drei Tagen rechnen. Das KYC bei Crypto Control hat mich am meisten genervt — Perso plus Stromrechnung, das ubliche Theater.

    Am Abend lande ich fast immer bei den Live-Tischen. Die Tische kommen von Evolution, an Crazy Time komme ich selten vorbei, plus reichlich Roulette und Blackjack. An ein paar Tischen wird auch deutsch gesprochen, langst nicht uberall, aber besser als nichts.

    Auf dem Smartphone geht’s uber den Browser, App fehlt, stort mich ehrlich gesagt kaum. Beim Support von Crypto Control bekommt man auf Deutsch Antwort, Wartezeit war bei mir selten uber zehn Minuten, auch wenn man teils Textbausteine bekommt. Lauft unter Curacao-Lizenz, also nicht nach deutschem Glucksspielstaatsvertrag reguliert, das sollte einem klar sein.

    Reply
  23. rever_deSn says:
    1 week ago

    Sto su Slot Shopper dallo scorso inverno e a questo punto posso parlarne senza sparare fesserie. Di roba ce n’e bella grossa, intorno ai 3.000 titoli piu o meno, con Play’n GO che tira la carretta. Gates of Olympus resta il mio solito punto di partenza, poi ci sono Yggdrasil e Betsoft per chi vuole volatilita alta.

    Il settore live e gestita da Evolution, quindi non ci sono sorprese: croupier reali, tavoli in italiano in certe fasce orarie, piu i soliti game show come Crazy Time che la sera si riempiono. Una cosa che mi ha dato fastidio: con 4G ballerino lo streaming singhiozza, ma immagino sia colpa mia e non loro.

    Sul bonus: il benvenuto di Slot Shopper gira intorno al 100% fino a 500€ piu 150 spin gratuiti, non tutti insieme ma a scaglioni. Si parla di un rollover 35x sul bonus, che non e regalato ma e nella media. Danno anche 20 free spin senza deposito se ti iscrivi alla newsletter, e comunque conviene guardare le promo aggiornate su slotshopper perche cambiano spesso.

    Deposito minimo 20€, iscrizione in pochi minuti pero il KYC va fatto, non si scappa. Uso la carta Visa e il prelievo mi e arrivato in 24-48 ore. Visa, Mastercard, i soliti e-wallet e anche crypto tipo Bitcoin, c’e abbondanza. La prima volta pero ho aspettato piu del previsto per la verifica.

    Da mobile si gioca via browser, si comporta bene anche su schermo piccolo, semplice e senza intoppi. Il supporto di Slot Shopper risponde in italiano via live chat, tempi sui 5-10 minuti, per un problema su un free spin mi hanno risposto con calma e risolto. Sono regolati con licenza Malta Gaming Authority, che e quello che guardo per primo.

    Reply
  24. rever_iySn says:
    1 week ago

    Bin da jetzt ungefahr funf Monaten aktiv, angefangen uber einen Tipp aus einem anderen Thread. Hangen geblieben bin ich bei Play Fortuna, ist vor allem das Portfolio. Irgendwo zwischen 3000 und 4000 Slots stehen da rum, Play’n GO, Yggdrasil und Pragmatic sind am starksten vertreten. Meine Dauerbaustelle ist Gates of Olympus, Big Bass Bonanza zwischendurch wenn die Laune stimmt.

    Beim Live-Zeug ist es fast nur Evolution, womit ich gut leben kann. Deutschsprachige Tische sind vorhanden zu den ublichen Zeiten, Crazy Time, Monopoly Live und Blackjack nehme ich fur die Abwechslung. Muss man sagen: ab und zu hakt der Stream, liegt aber wohl an meiner Leitung.

    Zum Bonus: 100 Prozent auf die erste Einzahlung plus Freispiele standen zur Auswahl. Durchspielen bei 40-fach — okay, aber kein Geschenk. Manchmal findest du Aktionen ohne Einzahlung, da muss man dran sein. Die laufenden Aktionen findest du aktuell auf play fortuna casino nach — lohnt sich vor der Anmeldung.

    Minimum sind 10€, ich nehme meistens Skrill. Kreditkarte, E-Wallets, teils Krypto stehen zur Verfugung. Die Abhebungen bei Play Fortuna kamen bisher innerhalb von 24 Stunden — beim ersten Mal dauerte es langer, Ausweis und Rechnung hochladen, dann war Ruhe.

    Die Registrierung war in zwei Minuten durch, Adresse und Geburtsdatum noch dazu. Eine App gibt es nicht, mobil geht uber den Browser und das reicht vollig. Der Livechat reagiert nach wenigen Minuten, auf Deutsch — teilweise etwas holprig. Was mich argert: Play Fortuna lauft unter Curacao-Lizenz, keine deutsche GGL-Genehmigung — wer hier aus Deutschland spielt sollte das wissen. Fur mich uberwiegen die Limits ohne 1-Euro-Deckel, andere sehen das anders.

    Reply
  25. rever_fiSn says:
    1 week ago

    Been playing at Trino for a good few months, mainly on the commute home, so read this for what it’s worth. Signed up after a random Twitter post, and sign-up took about two minutes — just email and a password, although they did want ID later, which I expected.

    Game selection is pretty huge — roughly 3,000+ slots and tables by my rough count. Pragmatic dominates, so expect the usual — Sweet Bonanza front and centre. Play’n GO supplies Book of Dead and Reactoonz, plus a fair amount of NetEnt in there too. My go-to is the Megaways section if I’ve got a bit of budget to burn.

    The bonus on Trino Casino was a 100% match to ?300 with 150 spins, split across a few deposits. Wagering is 35x, which is neither great nor awful. Minimum sits at ?20. There’s a no-deposit spins offer if you sign up to emails — it rotates, so you can check the live promos over on trino casino before you commit.

    Payouts are honestly the part that matters, and on this front Trino Casino has behaved. Cashed out ?280 via Skrill last week and it landed the same evening. Cards work, e-wallets are quicker, plus there’s Bitcoin and a couple of altcoins for anyone who bothers. My gripe: card withdrawals were painfully slow initially.

    Live chat is 24/7 and the people there actually read what you write, but getting a human can take ten minutes during peak hours. Live dealer runs on Evolution, so actual dealers, decent table limits for UK players, and Crazy Time if you like the game show stuff — I don’t, much. No app, only a browser version, which loads quick enough though sometimes logs me out mid-spin.

    Reply

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