Project Logs

Collapse

• Clock for 3.3v Arduino

  jlbrian7 • 03/20/2015 at 18:02 • 0 comments

  Changing from pin 9 and

  TCCR1B = TCCR1B & B11111000 | 0x05;

  to pin 5 and

  TCCR0B = TCCR0B & 0b11111000 | 0x05;
  

  generates the correct clock signal.

  What ever the clock signal is for the Uno, it is divided by two for the 8MHz 3.3v arduino.

• Possibilities

  jlbrian7 • 02/18/2015 at 02:45 • 0 comments

  I am using an arduino pro mini 3.3v with the MS5541, and I think that the problem may be that the 3.3v version operates at 8MHz instead of 16MHz. I will try to put it on a scope and play with the timer values for the pwm, but I don't know if I will get anywhere. I havn't been able to find any tutorials about it anywhere.

  I think that the other option will be to try to put a 3.3v reg on a 5v arduino and see how it works for me.

  http://mewpro.cc/2014/10/25/yet-another-3-3vizing-an-arduino/
  

• Testing

  jlbrian7 • 02/14/2015 at 13:12 • 0 comments

  I got it so that I am getting the same calibration words repeatedly, but not every time, and I don't seem to be getting a response for D1 and D2 which are the digital temp and pressure readings. When I put a multimeter on it it looks like it is responding, so I am hoping it is a timing issue. I will try putting a scope on it and see what I get.

• Test

  jlbrian7 • 02/11/2015 at 00:10 • 0 comments

  Hooked it up, and it is talking to me, but I can't make out what it is saying. Others on the blog say "It Works!"... Not for me.

  I think I will probably have to put it on a scope and make sure that the timers are right.

View all 4 project logs