Search found 2 matches
- Mon Feb 13, 2017 1:08 am
- Forum: ESP8266 boards
- Topic: i2c lcd works only if more one device connected
- Replies: 7
- Views: 6562
Re: i2c lcd works only if more one device connected
I had two issues with my LCD display, 1) The signal voltage on the bus is 3.3v, my LCD takes 5v logic high, so grab some logic level changer ICs for that 2) On the electronics side, pullup resistors are needed on the bus, if they are on the i2c board, the above will be needed, if not and you already...
- Mon Feb 13, 2017 1:02 am
- Forum: General Discussion and Questions
- Topic: I2C does not work. OS Error
- Replies: 14
- Views: 17539
Re: I2C does not work. OS Error
I was also baffled by this trivial error at first until I realised it is a simple factor of too much knowledge! The I2C.scan() function returns the addresses not in Hex, but in good ol' decimal! I was getting the result [30] from the scan and trying to access the device on 0x30, turns out that it is...