# Upload sketch to ESP32 C6 Super mini **URL:** \ **Category:** Networking, Protocols, and Devices\ **Created:** [December 5, 2025, 10:38pm UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208 "2025-12-05T22:38:21Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![johnhb](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/johnhb/32/239468_2.png) [@johnhb](https://forum.arduino.cc/u/johnhb)\ **Post date:** [December 5, 2025, 10:38pm UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/1 "2025-12-05T22:38:21Z")
I purchased two ESP32 C6 super mini modules from Aliexpress. I want to use a small footprint bluetooth module to control a TB6612FNG module to experiment with battery powered HO scale model trains. I was using the Live Mini Kit ESP32 which worked fine but was hoping to use the C6 smaller footprint. However I cannot upload the sketch. I have tried several different boards in Arduino but no success. I have tried to hold the boot button down , press and release the reset button. This brings on the blue led and changes the port available in Arduino from 10 to 14. But I get the same failed upload. Here’s the code ```arduino #include // Check if Bluetooth is available #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED) #error Bluetooth is not enabled! Please run `make menuconfig` to enable it #endif // Check Serial Port Profile #if !defined(CONFIG_BT_SPP_ENABLED) #error Serial Port Profile for Bluetooth is not available or not enabled. It is only available for the ESP32 chip. #endif BluetoothSerial SerialBT; const int PWM_CHANNEL = 0; // ESP32 has 16 channels which can generate 16 independent waveforms const int PWM_FREQ = 3000; // Recall that Arduino Uno is ~490 Hz. Official ESP32 example uses 5,000Hz const int PWM_RESOLUTION = 8; // We'll use same resolution as Uno (8 bits, 0-255) but ESP32 can go up to 16 bits // The max duty cycle value based on PWM resolution (will be 255 if resolution is 8 bits) const int MAX_DUTY_CYCLE = (int)(pow(2, PWM_RESOLUTION) - 1); const int OUTPUT_PIN = 19; const int DELAY_MS = 100; // delay between fade increments // input codes from Battery Throttle bool Power = 0; // P0 = power off, P1 = power on bool Direction = 1; // D0 = reverse, D1 = forward bool HLights = 0; // HL0 = headlights off, HL1 = headlights on bool TLights = 0; // TL0 = taillights off, TL1 = taillights on. bool Horn = 0; // S0 = Horn off, S1 = Horn on int AIN1 = 16; // D2 direction output int AIN2 = 17; // D3 direction output int STBY = 32; // D4 must be High to drive motor String loco_ID = "L4599"; //store loco_ID etc in eeprom. char buffer[2]; int DataReadIn[2]; bool locoDirection = 0; //forward int Speed = 0; int debug = 1; //set to 1 to show debug info on serial port. String commandString; void setup() { pinMode(AIN1, OUTPUT); pinMode(AIN2, OUTPUT); pinMode(STBY, OUTPUT); digitalWrite(STBY, HIGH); //high to enable DRV8833 Serial.begin(115200); SerialBT.begin(loco_ID); DataReadIn[0] = 0; DataReadIn[1] = 0; DataReadIn[2] = 0; // Sets up a channel (0-15), a PWM duty cycle frequency, and a PWM resolution (1 - 16 bits) ledcAttachChannel(OUTPUT_PIN, PWM_FREQ, PWM_RESOLUTION, PWM_CHANNEL); } void loop() { if (SerialBT.available()>0) { commandString = SerialBT.readStringUntil(62); //> interpretCommand(); if (debug){ Serial.print("Values In [0]= "); Serial.print(DataReadIn[0]); Serial.print(" and [1]= "); Serial.print(DataReadIn[1]); Serial.print(" and [2]= "); Serial.println(DataReadIn[2]); } delay(2000); } SerialBT.flush(); } void interpretCommand(){ int index1 = commandString.indexOf("L"); String whichLoco = commandString.substring(index1, 5); if (whichLoco == loco_ID){ Serial.println ("Command is for this loco"); int commandCode = commandString.substring(6, 1).toInt(); switch (commandCode){ case 1: {doEStopStart();} break; // Emergency stop case 2: {doDirection();} break; // direction case 3: {doSpeed();} break; // speed case 4: {doHLights();} break; // head lights case 5: {doTLights();} break; // tail lights case 6: {doHorn();} break; // horn } } } void doHLights(){ int commandValue = commandString.substring(7, 1).toInt(); switch (commandValue){ case 0: {Serial.println("Head lights Off");} break; // Hlights off case 1: {Serial.println("Head lights On");} break; } } void doTLights(){ int commandValue = commandString.substring(7, 1).toInt(); switch (commandValue){ case 0: {Serial.println("Tail lights Off");} break; // Tlights off case 1: {Serial.println("Tail lights On");} break; } } void doHorn(){ int commandValue = commandString.substring(7, 1).toInt(); switch (commandValue){ case 0: {Serial.println("Horn Off");} break; // horn off case 1: {Serial.println("Horn On");} break; } } void doDirection(){ int commandValue = commandString.substring(7, 1).toInt(); switch(commandValue){ case 0: {Serial.println("Direction is reverse"); digitalWrite(AIN1, LOW); digitalWrite(AIN2, HIGH);} break; case 1: {Serial.println("Direction is forward"); digitalWrite(AIN1, HIGH); digitalWrite(AIN2, LOW);} break; } } void doSpeed(){ int commandValue = commandString.substring(7, 1).toInt(); if (commandValue>=0){ if (debug){ Serial.print("Speed is "); Serial.println(commandValue); } int dutyCycle = (commandValue); analogWrite(OUTPUT_PIN, dutyCycle); } if (debug) { Serial.print("Speed is "); Serial.println(commandValue); } } void doEStopStart(){ int commandValue = commandString.substring(7, 1).toInt(); switch (commandValue){ case 0:{ digitalWrite(STBY, LOW); digitalWrite(AIN1, LOW); digitalWrite(AIN2, LOW); Serial.println("STOP");} break; case 1:{ digitalWrite(STBY, HIGH); Serial.println("RUN");} break; } } ``` and this is the error message Compilation error. #error Bluetooth is not enabled! Please run _make menuconfig_ to enable it. Where can I find _make menuconfig_? A search on Google only directs me to Linux articles. The board selected is the ESP32C3 Dev module. I get the same error when ESP32C6 Dev module selected. My apologies if I have posted this article in the wrong place. Hope someone can make sense of my problem and help me out. ---
**Author:** ![kmin](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/kmin/32/1147370_2.png) [@kmin](https://forum.arduino.cc/u/kmin)\ **Post date:** [December 5, 2025, 10:47pm UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/2 "2025-12-05T22:47:58Z")
> [@johnhb](#): > > `BluetoothSerial.h` I would expect that library using classic bluetooth, which C6 doesn't have (BLE only). ---
**Author:** ![sterretje](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/sterretje/32/391294_2.png) [@sterretje](https://forum.arduino.cc/u/sterretje)\ **Post date:** [December 6, 2025, 5:07am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/3 "2025-12-06T05:07:16Z")
> [@johnhb](#): > > My apologies if I have posted this article in the wrong place. The category where you posted is OK. Your topic title a little less so 😉 When I did read the title I thought it was an upload problem but it is a compile problem. Maybe you should change the topic title 😉 Pushing whatever button on your board will not solve compile problems. Compilation can actually be done without a board connected. ---
**Author:** ![horace](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/horace/32/1014299_2.png) [@horace](https://forum.arduino.cc/u/horace)\ **Post date:** [December 6, 2025, 6:40am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/4 "2025-12-06T06:40:02Z")
if you have a look at [Comparison chips (SoCs) table for ESP8266/ESP32/ESP32-S2/ESP32-S3/ESP32-C3/ESP32-C6](https://gist.github.com/sekcompsci/2bf39e715d5fe47579fa184fa819f421) - it shows the ESP32C6 only supports BLE try File\>Examples\>BLE\>UART for a BLE serial example if you require Bluetooth Classic try the original ESP32 ---
**Author:** ![GolamMostafa](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/golammostafa/32/239011_2.png) [@GolamMostafa](https://forum.arduino.cc/u/GolamMostafa)\ **Post date:** [December 6, 2025, 6:51am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/5 "2025-12-06T06:51:50Z")
Information in the atached file may help you: [Text-1ESP32C3SuperMini (1).pdf](https://forum.arduino.cc/uploads/short-url/1w1OguRQ5p5YmHz8BRs4TrdTRSn.pdf) (360.8 KB) ---
**Author:** ![johnhb](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/johnhb/32/239468_2.png) [@johnhb](https://forum.arduino.cc/u/johnhb)\ **Post date:** [December 8, 2025, 1:42am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/6 "2025-12-08T01:42:18Z")
Thank you sterretje,. I have compiled two example sketches, Server.ino and Scan.ino from the BLE examples. No problems in compiling but I cannot upload either sketch unless I hold down the boot btn. However, after what appears to be a successful upload I see nothing on the system monitor despite the setup having a Serial.println(“Stating BLE work!”) ---
**Author:** ![johnhb](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/johnhb/32/239468_2.png) [@johnhb](https://forum.arduino.cc/u/johnhb)\ **Post date:** [December 8, 2025, 1:46am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/7 "2025-12-08T01:46:27Z")
thank you horace. I tried two example sketches from the BLE section - Scan.ino and Servo. ino. If I hold the boot btn down I can upload either sketch but when I open the system monitor I see nothing despite the setup having the code Serial.println(“Starting BLE work!”). ---
**Author:** ![Brazilino](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/brazilino/32/1198404_2.png) [@Brazilino](https://forum.arduino.cc/u/Brazilino)\ **Post date:** [December 8, 2025, 1:56am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/8 "2025-12-08T01:56:09Z")
Make sure to have the option USB-CDC on boot “enabled” ![image](https://europe1.discourse-cdn.com/arduino/original/4X/e/5/4/e543d0a81301f8f17e49e4739d4c5b57040e705f.png) ---
**Author:** ![johnhb](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/johnhb/32/239468_2.png) [@johnhb](https://forum.arduino.cc/u/johnhb)\ **Post date:** [January 31, 2026, 2:54am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/9 "2026-01-31T02:54:41Z")
Thank you to all who replied to my post with various suggestions. A very simple solution - I bypassed my USB hub and used a cable directly to a second USB port on the PC. Problem solved, sketches upload without any issues. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 30, 2026, 2:55am UTC](https://forum.arduino.cc/t/upload-sketch-to-esp32-c6-super-mini/1418208/10 "2026-07-30T02:55:17Z")
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