Recent content by dandlion

This may be a dumb question - but - I've studied the pin-out diagram very carefully and I can't find a Shield Header pin for the 28X2 hardware pin 7 (or Pin A.4). Where did it go? (The one labled "TXD" on the chip diagram).

How do I indicate a break in the strip. In other words - a "cut" or an opening. Can't find a "component" that would work. A simple fat circle would work.

I am designing a board with 3 08M2s - all pre-programed. My question is: Can I tie the unused Serial-in pins to ground via one 10K / 22K pair or do I need to tie each one separately through its own resistor pair? I'm not sure why 2 pull-down resistors are required on the serial-in pin but...

Please someone explain which is better to use when using SEROUT/SERIN communication between PICAXE chips: N "inverted" polarity or T "True" polarity. My serial LCD display module requires "True" and that's what I am using and it works just fine. The book says to use "Inverted" polarity when...

I am using a PICAXE 08M2 to control each wheel of my robot. I want to count the pulses from my home-brew optical encoder. It is not a real high resolution device. There are only 18 bright/dark transitions and the disc is mounted on the final drive shaft so the revolutions are only in the realm...

Thanks for your help. I arrived at the resistor values through experimentation to get the biggest voltage swing. I have 330 ohms on the LED resistor and 10K Ohms on the ptx resistor. I followed your suggestion to check the polarity of the ptx. I thought it was right but I swapped it anyway...

Thanks. Pls see revised post

I thought the command if pinc.6 = 1 would cause the pin to be set as an input. Not so? Yes, the voltage at the emitter is zero when off and 5.1 when on.

I thought the command if pinc.6 = 1 would cause the pin to be set as an input. Not so?

I have built a motor encoder using an IR LED and a phototransistor. The circuit seems pretty straightforward to me. With the output of the LED shining directly into the phototransistor (on the breadbord - in reality the light will reflect off black/white encoding disc) the output as measured by...

Some help/advice please. What is the easiest/simplest way to pass 1 word (2 bytes) between two PICAXE controllers, one of them being an 08M2? Actually, only the data going TO the 08M2 needs to be 2 bytes - going back the other way just needs to be a signal of some sort to note task...