Reset problem with I2c backpack- HT16K33
Moderators: adafruit_support_bill, adafruit

Reset problem with I2c backpack- HT16K33

by Jay Hamlin on Wed Nov 14, 2012 10:36 am

I have 4 of the 4 digit 7-Segment displays on an Arduino and was having trouble with the Adafruit I2c library frequently hanging inside begin(). I noticed in the HT16K33 datasheet that you should allow at least 1MS after enabling the clock so I added 2 delays in begin... problem solved! My begin now looks like this:

void Adafruit_LEDBackpack::begin(uint8_t _addr = 0x70) {
i2c_addr = _addr;

Wire.write(0x21); // turn on oscillator
delay(5); // <- My addition
delay(5); // <-- My addition
setBrightness(15); // max brightness

Reset is now 100% reliable. Best of luck. Jay.
Jay Hamlin
Posts: 1
Joined: Wed Nov 14, 2012 10:20 am

Re: Reset problem with I2c backpack- HT16K33

by adafruit on Thu Nov 15, 2012 8:27 pm

thanks for the note!

Posts: 11907
Joined: Thu Apr 06, 2006 4:21 pm
Location: nyc