Mindboards

1. Address For reasons that I have not looked up yet, the Wire library for Arduino uses the upper 7 bit of the 8 bit device address. So that makes 0x50 = 0101 0000 shifted right once to 0010 1000 = 0x28. 2. Control byte format The control byte has of 8 bits which are: start bit, 3 channel bits and ...

sure. byte Max127msg[] = {0x50, 0}; This is the message array for the I2C-device. First element ist the 8 bit device address. So I don't have to build the message array every time, I only set the following element(s) containing the actual message (initially 0). In my case it is just one control byte...

If it's just for the sake of shortening, one might do it this way: #define MAX127PORT S1 byte Max127msg[] = {0x50, 0}; // Message array for the adc int MAX127Value(byte channel) { byte count = 2; byte reply[]; // Control byte: start bit (7) + channel number bit-shifted into place Max127msg[1] = 0x80...

I tried the suggested solution and it works splendidly. Besides, it is not so much more. You just have to build the array and don't have a read-Method. The most significant difference compared to my efforts is the use of the 8-bit address (0x50) instead of the 7-bit version (0x28 = 0x50>>1) for ardu...

Hello everyone. I made an I2C-8-Channel-ADC (MAX127) talk to an arduino board using the Wire library for I2C communication. No problem there: Wire.beginTransmission(0x28); // start talking to device 0x28 (7-bit-address) Wire.write(0x80); // send command byte: convert value at channel 0. Wire.endTran...