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Thanks for all the wonderful information and for sharing your projects. I love Picaxe products and have enjoyed a decade or two of using them, however my health has deteriorated in the last month. I have stopped all electronics entirely expecting to power down soon. Keep up the wonderful forum...

Are you using SMD parts already? if not time to look into them... :)

Welcome to this forum... looking good!

@tmfkam Would be interesting to see how that works on 4 inch plastic drain with various water levels & plates... @erco I have one of those on floor near my 10 yr warranty water heater now 30 yrs in service... ;-0

There are some small stainless float switches with magnet enclosed that could work for you - see attached pic from an Ebay listing

Depending on the physical situation often a pressure transducer works well...

@1968neil FWIW Analog Devices has a line of RMS to DC converter ICs - https://www.analog.com/en/parametricsearch/11023#/ If you really need RMS values fairly fast... another slower approach is to look at heating capability of the AC waveform and relate that to more easily measured DC heating...

That module appears to be mainly an isolation unit - why do you need to use it? Perhaps be more informative on what voltages you want to measure and the accuracy needed...

You might post this new and also specify HOW FAST pins need to change - given some milliseconds; " B6 must go low and B5 must go high, which will make B2 high " Item1: low b6 high b5 high b2 RETURN Term 'must' not well defined... ;-0 Please post some of your code...

Well done ;-0 If you want to try color changes an APA102 works well with the 08M2

@cracboum please give number & manufacturer of opto-triac that failed - thanks for the information.

I learned a bunch from hippy even before he was official on this forum... Hope hippy is doing well and will some day stop by and say hello for old times sake even if for nothing else... hippy - thanks for all your good thoughts and knowledge and thanks also to present posters for keeping the...

Looks like you have your problem solved... I am still wondering about the 630Hz - seems to me it is likely an artifact of the measuring system rather than the well geometry... if you point your device at a wall 100 feet away or such does the 630Hz still appear? Just trying to reconcile my...

Not clear what 630Hz has to do with what you want to measure - Just a DC hit to the speaker should produce a good echo. Simple rectifier and RC short time constant filter on microphone end could work ok. - you can use the speaker as a receiver with appropriate amp. Maybe the 630 Hz is a small...

Willie - despite what Jeremy says it looks from your oscillograph traces you could come close enough for some practical use... some analog or DSP processing of the signal could help or just a peak capture circuit for first echo... Suggest trying different rapping than speaker to see what that...

OK I missed actual head of water and you do not want to use bubbler [I get about 65PSI if I understand correctly .44 PSI per foot]. I have pulled deeper pumps in the good old days of iron pipe... that water & pipe ARE heavy! As I mentioned my current well uses a Pump Saver unit which checks...

FWIW a reliable and likely good way to implement a solution is to run a small bore pipe down to the pump top and use compressed air at the well head forcing bubbles at the pump top to determine the water depth above the pump with a pressure transducer on the compressed air needed to make bubbles...

Likely you need to exclude pump running sounds and drip sounds so best take a listen before going too far... don't know if SRF ultrasonic sense units can do skinny bore work... in any case I would check several readings in a row for consistency before accepting the reading. There are commercial...

Given the OPs original statement and parameters... estimate 20ms .04amp .5 voltage drop.... Q=CV=IT or C = IT/v hence .(04x.02)/.5 = .0016 Farad [hopefully this is 1600uF...] so 2 x 1000uf could work... ;-0

well... the unit is a V+/- and out pin module... you might start measuring the output with 1 amp running through the current loop and the module powered... then note that you can use READADC command on PICAXE pin connected to output... what have you tried??