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Finally got round to getting this solution in its hardware state. 4 x 3 keypad and 4 x 4 keypad fitted with unique resistor matrix to give a near perfect linear voltage spread across each key press. 0.39v across each key on the 4 x 3 keypad. 0.29v across each key on the 4 x 4 keypad. Now the...

Can I ask for clarification please. I want to drive approx 30 LED's, each LED needs to be controlled individually so was thinking to hook up via 4 x ULN2803a, then each pin to a 40X2, this would be controlled via a 2.4Ghz R/C transmitter. Not worried about coding at the moment but should be a...

Just a quick question guys. Is the 14M2 exactly the same as the pic 16f684?

Hello all, sorry it has been a while since I have posted but other things have taken priority. I have a project I would like to undertake, and need the Picaxe collective to see if it is viable. I would like to make a cable tester, the cable is 25 pin D-sub to 17 pin 12mm socket, manufactured...

Hi again all, long time no see................;) I am after some advice/pointers/help. I am planning to build a scale model PT boat and it requires 3 brushed motors to run it, now I came across this website during my searches for info and was wondering if a Picaxe could do the same job? Scroll...

Is this circuit pie in the sky, to simple or just plain daft? Basically I am making a small PSU and want to display volts and amps. Voltage is max 18V and Amps is max 2A. Can it be done? Has it been done?

Good morning all, I could do with some help on this barrier idea of mine please. The concept is a barrier using I/R emitters to I/R photodiodes, now the barrier is only 350mm x 250mm and is going to be used to catch small insects, birds etc in flight by breaking the beam which is connected to...

Good afternoon fellow Picaxers, I recieved a couple of these in the post today? I signed up sometime back on the TI website for their news letter and I must have clicked a link or sorts and get the odd freebie. Could these be of any use in the Picaxe world, some sort of data /comms link...

Good morning all, I have found this superb Instructable for an 8X8X8 cube, the only thing is it runs using the ATMega32. Rather than going down the route of using a different operating system/language/processor, can it be done using a Picaxe?

Good morning all, I had a bit of a disaster yesterday with the USB download cable, I inadvertantly sent 12v down it/ up it, and it became red hot after that, so removed it immediately. A serious lack of care............!!!!!! Anyhow, I can no longer download anything (suprisingly), I did the...

Good morning all. I have been making inroads into using the parallel OLED interface kindly submitted by Nick12ab, I have it up and running and is as sweet as a nut, rapidly fast and am very impressed with its performance. BUT, and with all things, there is a trade off, parallel is code hungry...

Can anyone point me in the right direction for PCB mounted thumbwheel pots? I have found one site but it only sells 10K ones I need some 500R, 4k7 ,47K and maybe a few other sizes. I was toying with the idea of modding some little skeleton pots I have but they seem a tad fragile, has anyone any...

Can 1 output pin drive 4 of these IRF510 FET'S? Basically I want to see if it is possible as I would like to free some pins up, I have the 4 FET'S on individual pins at the moment. they drive 4, 12v solenoid coils that have 30 ohm resistance, sorry but I have no data sheet for the coil. I have...

Maybe not new but this has been rattling around my head for a while and was wondering if it is at all possible? While designing and building my CNC machine (still in the mechanical stage of construction) and watching two robots (at my work place), the thought/idea came to me about building my...

Can the Rev-ed unipolar stepper motor be half stepped using the circuit provide in maual 3 page 16? I have it running fine at the moment using the toggle command but would like to get the steps down to an even finer resolution without the need for further circuitry. Thanks in advance Stewart

Well after 18 months of head scratching, additions, and several versions I have finally finished my controller. Originally it was just going to be a single water drop controller to photograph water drop collisions, similar to the Cognysis system, but once I started it seemed to start to run away...

I would like to be able to input into a word variable a value of between 0001 and 9999, now I can do that as long as the value is above 0999, no problem, but when I input a value below 1000 I get 999 or 99 or 9 where I would like it to be 0999 or 0099 or 0009. I currently use this code to get...

I shall apologise first off for a lack of detail as I am at work and unable to offer photo's of circuit. My problem is on an optocoupler circuit to fire my camera, it works fine with just the camera on, and OK when I add my flashgun onto the camera, the problem arises when I add my 90mm home...

Hi all, A simple question needing a simple answer. I did have a ULN2003A driving a small stepper, but I had to swap this chip onto another project so it has left me with no driver for the stepper. The question is can the ULN2803A step in its place, I know its an 18 pin package and the...

I have the following stepper motor (ASTROSYN 23KM-K033-03), (similar to the NEMA 23?) and am wondering if using the ULN2003 Darlington driver and 08M2+ as shown in manual 3, it would drive it. Its only to drive it forward and backwards to open a chicken coup door, nothing special, I have the...