This may be me but here is the situation I am communicating via the I2C bus to a Devantech SD21 using an Ardunio Mega 2560 If I use the Arduino on board 5 volt and ground everything works ok. If I try to use 5 volts to the SD21 and simply use the SDA/SCL from the Ardunio the sketch hangs, the 1st…

odd issue with Arduino Mega

CrossRoads October 31, 2012, 8:18pm 6

Glad to help.

Topic		Replies	Views
I2C problems on arduino mega Sensors	14	9335	May 6, 2021
[Arduino Mega] Wire Problem / defect ? Troubleshooting	4	1061	May 6, 2021
Is my Mega broken...? Networking, Protocols, and Devices	4	1128	May 6, 2021
Cannot upload code to Arduino Mega when connected to external power supply IDE 1.x	14	5985	May 5, 2021
2560 upload hangs; L-led blinks / No RX,TX blink General Guidance	6	2769	May 5, 2021