Picaxe for detectors?

[Bobman]

Does anybody know whether a picaxe running at 16Mhz will provide accurate 50us timing pulses. The pauseus command is supposed to allow microsecond use but the instruction rate can be as long as 100 - 200us per command?
The Arduino nano detector (thanks George) certainly copes well with these pulse widths but maybe the nano is much more efficient or the programming real clever?
Perhaps I should try a picaxe loop program of typical pulses and check the results on an Oscope but I thought someone may have tried in the past.

[Altra]

Never worked with a Picaxe, but the code looks very similar to the old Basic Stamp language. I think the picaxe will be fast enough. But you need to use a timer interrupt for your main timing. Goto loops are unpredictable and slow. Turning a pin on or off is fast, but avoid other commands in the interrupt routine, most are slow

Use this code as a template. Adjust the timer pre-load value to interrupt at about 1000hz

https://picaxeforum.co.uk/threads/mu...nterrupt.8541/

Then add something like the code below between interrupt and return labels. Change pins B.1-B.3 as needed to match your circuit

interrupt:
high B.1 'Tx on
pauseus 50 'TX width
low B.1 'Tx off

pauseus 10 'sample delay

high B.2 ' Target Sample on
pauseus 10 'Target sample period
low B.2 ' Sample off

pauseus 200 'EF sample delay

high B.3 ' EF Sample on
pauseus 10 'EF sample period
low B.3' EF Sample off
gosub timer_setup
return