Hi
I have a Mega 2560 example I would like to get working on the esp32. Would like to firstly know if this could be done and maybe some pointers on how I can achieve this.
thankspH_I2C.ino (6.1 KB)
Do you get any errors when you compile the code for ESP32 ?
none, on the mega I can send commands via serial monitor and it responds normally. on the esp32 I get nothing from trying to send commands
this code below sends/receives via the esp32 fine.
ph_i2c_esp32.ino (1.9 KB)
The call
Wire.begin(); //enable I2C port.
uses the hardware I2C-interface which on an ESP32 is
SCL on GPIO22
SDA on GPIO21
So I estimate the hardware is not connected the right way.
I2C needs 4,7kOhm Pullup-resistors. So you have to check if the Arduino Mega 2560 has these pullups on board or your I2C-device has the 4,7kOhm Pullup-resistors already connected.
If not you would have to add them.
The program is pretty short and easy. Anyway I would use the I2C-scanner-demo-code first to see if your device responds at all.
a deviceadress of 99 is rarely seen. Are you sure that this is the right I2C-adress?
99 is correct. the 2nd file I uploaded works fine. im using a sparkfun thing plus esp32 wroom SparkFun Thing Plus - ESP32 WROOM (Micro-B) - WRL-15663 - SparkFun Electronics plugged into the Qwiic connector (12c port)
the libraries that are used in the second sketch are not common.
So just take a look into them what is different in relation to your first sketch. I will not go searching for those libraries. If I eventually will take a look into them you have to provide them
best regards Stefan
The first sketch uses serialEvent() which the ESP32 core does not support.
Use if (Serial.available() > 0) { ... } inside loop() instead.
It was my own decision to write an answer based on a lot of assumptions. Most of my assumptions were wrong. My own fault.
I invested time in describing non-relevant details.
I will right now after posting this message write a three letter hotstring for Autohotkey that types out a message "please describe in detail what hardware are you using .. " etc.
best regards Stefan
im using EZO™ pH Circuit | Atlas Scientific & Electrically Isolated EZO™ Carrier Board | Atlas Scientific
I will give it a shot, cheers
the ph-meter offers UART-mode. IMHO this is easier to use
best regards Stefan
need i2c only for other reasons
thank you sir, this has worked!!
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