Search found 2 matches

by tech1337
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...
by tech1337
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...