PICAXE-08 PROTO BOARD KIT- Reference design

Thread Starter

Khisraw

Joined Nov 14, 2020
33
Hi All,
I am using the PICAXE-08M2 MCU in my new design.
My program:
Generate 3V output on the C.0 or pin7
Generate 38Khz PWM signal on C.2 or pin 4.

The code works fine and I get the desired output on the development kit but when I transfer the IC to the breadboard, it just acts funny. The output I see are;
C.0 or pin7- keeps jumping between 300mV to 1.7V
C.2 or pin 4 = 700mV instead or 3V

The development kit link is below.
https://picaxe.com/docs/axe021.pdf

There is nothing special about the power connections. I power up the chip as explain on page 27 of the PICAXE-08M2 datasheet.
https://picaxe.com/docs/picaxe_manual1.pdf

It could be my naivety but I was thinking if program the IC and power it up on my breadboard as it explains on the datasheet, the chip should work as programmed, no?

To test the IC, I take the same IC back to Dev Kit and power up the Kit, works perfect so why not on the breadboard. Do I miss something?

Can someone give me some feedback?
 

Irving

Joined Jan 30, 2016
1,496
In theory yes, so there's something wrong with your breadboard layout. Can you post a picture of it so we can see the layout?
 

Reloadron

Joined Jan 15, 2015
5,934
I have that board and the layout is exactly as shown in your link where it is labeled "Prototyping Area". Unless there is a wiring issue if you are following the layout there should not be a problem. That or a poor solder joint on the board.

Ron
 

Thread Starter

Khisraw

Joined Nov 14, 2020
33
Thanks, guys.
The main problem was leaving Pin2 floated. It should have always connected to GND otherwise it doesn't function.
 

Reloadron

Joined Jan 15, 2015
5,934
Oh yeah and that's why the proto board has a jumper. When you are not programming the chip the Serial In is grounded through a 22 K resistor using a jumper. Glad you got it worked out. :)

Ron
 
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