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Hi folks, Sorry it this this a foolish question but I need to be able to read a tach signal from a 4 Pin PWM fan. The problem is that the spec states that the open drain tach pin of the fan needs to be pulled up to 12V. I need to sample this and feed it into a PICAXE 28X2 so I can then drive...

Hi Folks, Forgive me if this is a foolish question but I am going to ask it anyway as I have discovered somthing strange but wonderful. I am reading the temperature from five DS18B20 sensors via the READTEMP12 command using a 14M2 picaxe. By accident I forgot to add the 4.7K pullup resistors...

A very good thought Mr Hippy, I've just checked the legs again just in case and unfortunately it's all connected. Hang on a moment and I will show you a diagram.... All the legs on the lower left hand side upto and including the 3 used by the resonator are connedted as shown in the diagram...

Ha!, it doesn't get hot any more. :D That's the voltage regulator, it will power the picaxes that you see, plus another display board that looks like this: The 2nd beastie uses about 200 milliamps and it's all powered by the PC power supply's 12V (Yellow) line. So as a quick guess I will need...

Hmm, an AXE401 Shield Base you say. I like it, I want one too!. Thank you very much for doing the test. I will carry on trying to work out what's going wrong at my end. Just in case you are interested, this is what I am building! It drives 8 Fans via PWM, and decodes the garbled tach signal...