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I have some oil pressure gauges and senders that are mismatched and the senders are a right git to get at so..... The gauges are 0-5 bar range and senders are 0-10 bar range so I only half readings, the range of the senders and gauges is 10 ohm bottom to 180 ohm top and linear, can picaxe be...

The idea is for engine alarms so the buzzer only sounds if the engine is running and an alarm is triggered else just the light comes on, it seems volvo use the alternator field winding lead that goes to the charge light and a zener diode so the buzzer only gets power when the alternator is...

Thanks for the ideas guys.

Hi guys, not been here for a while due to other things... Is there a way to take a feed from an alternator's W terminal (tacho pulse output for diesel engines) to a picaxe and check to see if an engine is running or not? I'm well rusty with all things picaxe and electric in general so any...

It won't be connected to a car battery in any way, probably 12v from a mains transformer that is already in use powering a fuel flow meter and a 7805 down to 5v for both picaxe and sender, sender will be 2 wire isolated from mounting screws. As said this is not in a vehicle just a static...

It won't be connected to any automitve electrics, just an automotive type sender so no problem there, the engines we run have no electrics except the starter motor, ignition is closed magneto system with just a ground to stop it if needed and plug leads are fully screened, fuel injection systems...

Thanks for the input guys, the sender I'm looking at is a multi reedswitch/resistor ladder type which goes in jumps, it's for a rigidly fixed header tank on an engine testbed so no sloshing to worry about, as it's avgas I wanted something definately rated for use with petrol hence going for...

How would picaxe get on with reading adc value from automotive level senders? I have the choice of EU range of 10-180 ohm empty to full or US range of 33-240 ohm empty to full, I've only done adc on 0-10k before, will it cope?

I built a circuit in 2012 (may have been earlier)following someone from here's pattern (Matherp I think it was) that used an 08m2 to read from a 4 channel i2c op-amp connected to thermocouples, take a reading from an 18b20 for cold junction value and lookup the conversion table from an i2c eprom...

I have a warning system on my boat (twin VP's) that involves a temp sensor on the outside of the raw water pump, they get very hot very quick if the water supply isn't there, I did it because one was a sod for not priming on first startup after standing for a few weeks. Mine was done with...

Just a quick nip back to windows updates, I updated a win 8.1 pro machine to win 10 friday and it still activated on the same licence free of charge with no problems, I did it to a cloned hdd to keep my original setup working.

I have to salute you guys for the time and effort you are putting into this, good luck, it sounds like you are getting somewhere. (y)

Sounds like a good reason to get PE compatible with linux systems to me.

The method in post 4 is pretty much the same as I did and took very little time, I did find debug doesn't work properly (kept sending windows scatty) but anything without a debug worked fine. I did not try it to save any money (in fact barely cheaper than axe027) I just liked the idea of having...

I just bought one of these cables to try as a programming cable for picaxe with the benefit of having +5v on the same cable, had to do a minor bit of configuring but works an absolute treat, the configuring consists of downloading and installing FTprog from the ftdi website and inverting the...

I think I have found the problem, it seems I have my < & > the wrong way round, maybe I should change my name to Captain Dopey! Thanks for all your help guys, AllyCat you were spot on. (y)

Thanks very much for above suggestions. OK I've done away with the gosub 'change' and bought it into the main program and added min 0 and max 255 to my +-4 allowance and still get the same problem, if I comment out the read adc's and use let b0 = 92 (the problem figure) it's spot on, I've done a...

The timing issues are without debug as well, as soon as I take out the bit to check adc within the loop it's fine, code is below, it's the commented out bit that's annoying me, the gosub for it is at the bottom. #picaxe 20x2 Symbol pulsetime = w8 ;time to start wiper Symbol wipetime = 1500...

How quickly can I expect a readadc to run in a do-loop? I am trying to set a delay via adc and want to check for changes in the control during the delay period so I using a do-loop which re-checks the adc in each loop and compares to see if it has changed but I am getting a rapid speeding up in...

I think I jumped the gun a bit posting the question as I have found some 5v dpdt relays rated at 8A and I have a couple of 7 & 8 way darlington ic's in my box of tricks along with 3A rectifier diodes to give a bit of protection with so should be able to a single board job of it, also using dpdt...