Hi,
I want to run 2 picaxe 08M2's from the one PWM source.
I have a remote control driving a motor in a model train which uses a picaxe to drive a relay to give me direction control.
The picaxe monitors the PWM looking for a command which toggles the relay.
I also have a diesel simulator using a picaxe sound generated card that varies in line with the PWM signal.
I have run the 2 circuits separately and they both work.
When I connected them to the same point the 2 picaxes seem to interfere with each other, with the sound cutting out and not changing in line with the PWM signal..
The relay drive is connected via a 1K resistor and the sound is connected by a 12K /47uF RC network to the same PWM point.
The input at the sound card is a varying DC voltage the product of the RC network.
I am wondering if the RC network is introducing some form of interference or a loading issue.
I did try to connect the sound card to the motor output during development but it is a level of -12V and the signal is inverted and it became to cumbersome for my limited skills.
The PWM point is the input to the motor drive FET and is a +5V signal.
Am I on the right track and if so any suggestions are more than welcome.
Thanks in advance.
Graeme
I want to run 2 picaxe 08M2's from the one PWM source.
I have a remote control driving a motor in a model train which uses a picaxe to drive a relay to give me direction control.
The picaxe monitors the PWM looking for a command which toggles the relay.
I also have a diesel simulator using a picaxe sound generated card that varies in line with the PWM signal.
I have run the 2 circuits separately and they both work.
When I connected them to the same point the 2 picaxes seem to interfere with each other, with the sound cutting out and not changing in line with the PWM signal..
The relay drive is connected via a 1K resistor and the sound is connected by a 12K /47uF RC network to the same PWM point.
The input at the sound card is a varying DC voltage the product of the RC network.
I am wondering if the RC network is introducing some form of interference or a loading issue.
I did try to connect the sound card to the motor output during development but it is a level of -12V and the signal is inverted and it became to cumbersome for my limited skills.
The PWM point is the input to the motor drive FET and is a +5V signal.
Am I on the right track and if so any suggestions are more than welcome.
Thanks in advance.
Graeme