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I want to have two IR LED's, one emitting IR, the other receiving any reflective IR and measure level. If I use Irout, modulated to minimise ambient light on the TX device , and use Irin on the RX device to catch back any reflection, then how can I sense level changes of IR coming back. In...

Has anyone experience on actuating a Satellite dish to cover several Satellites. I have a ground fixed pole mounted motorized dish. Unfortunately it has to be removed due to trees being felled nearby. I want to reinstall it afterwards, but as the trees have been causing subsidence, there is a...

Always a problem to find raw materials when building projects. I have just used some of this material for a panel to mount infrared illuminators on to go inside an external floodlight box to work as CCTV camera illumination. I used 3mm stock. It was rigid to use as well as so easy to cut, just...

Thanks Hemi345, I ended up drilling out these Meccano cranks. http://www.meccanoandcomp.com/userimages/procart11.htm Being of brass they drill easily. Only problem is they deserve a drill stand, and care not to loosen the brass part from the plate. Another part was costing £6 which I dropped...

I have a project on a childs toy guitar. It has 5 buttons on the fret part that did play noises. I am trying to find how to make something thats not just a horrible beep. Has to make more than 1 noise at a time, something with vibrato. I admit jumping to a 555 but that only produced clicks or a...

Thanks again, yes I am in the UK. I am trying to use the UDN2981 to feed one side of a relay, with the other side of the relay connected to ground. The attached shows what I am trying to do, but from a Picaxe, and the opposite end going to ground and not +5 volts (circuit shows 12v, but I am...

Can the output of a ULN2003 sink to ground? Trying to get a positive output from it to drive a relay between it and ground. Picaxe being fed into the ULN2003. Thanks

Anybody tried this, seems cheap? http://www.ebay.co.uk/itm/271540629231?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 Lots of other goodies on their site

I have a remote control unit (RevEd product) which works well with a Picaxe board with Irin. However I am trying to see what I would need to extend this over many feet, ie what would I need to bridge the gap using cable. Would I need to make another receiver (to accept output from my RevEd...

I have a Picaxe 20M2 where I fitted pullup 10k resistors to some pins as I wanted to use them as inputs. However I now want to use them as outputs. My question is do I have to remove the resistors. Thanks

I am trying to do a PCB design for a Picaxe project, however I seem to be getting unwanted objects on my artwork. Some were crosses, which I got rid of by not showing the component outline reference, a pain because I had to right click on so many resistors to hide their outline references. My...

I have aquired a bed pressure mat, which I want to use with a Picaxe as an alarm when someone leaves the bed at night. The company who sold it are not interested in telling me how it is wired, as it is not being used with one of their monitors. The matt is made in China by a company called THF...

Many thanks everyone, now that explains the problems. I was following this circuit for the hall switch, and as I did not want an LED shown, I did not realise I was omitting a method of pullup. Added with other bits pointed outnow sorted out. I have learnt something as well as looking for...

There will be a Picaxe in this, but this circuit worked on breadboard but now making a neater job it does not work. Really desperate to get working as for an elderly relative who gets off his chair without the carer seeing. It has a hall effect switch which when a magnet moves away is triggering...

I'm not near my PC to try, but do I have to establish a fixed reference voltage with a Picaxe being used for a low battery alarm, or can I just use ADC values. Thanks

I would like to put a mobile phone type battery in a Picaxe hand held project, ideally with a socket to allow charging the battery while still in the case (just like charging a mobile phone) Has anyone found such a battery to use plus a charger to plug in?

I am looking at the 4.5v battery 3RL12 (ALKALINE, ULTRA 4.5V 3LR12 - 632856 - ENERGIZER) but I cannot find how connections could be made as the specs just say "pressure". Anybody know this battery? can I solder to it? etc Thanks

I am making a battery operated alarm in which pressure mats are connected. The alarm is to raise awareness to an elderley person getting out of a bed, or getting out of a wheelchair. Only one pressure mat will be plugged in at any one time, however I have two problems. One mat has contacts...

Thanks erco. They are not connected together as yet, as I do not know the best way. Can I take pin 1 of the receiver into 2 Picaxe inputs? or would I have to use series diodes into inputs to give seperation The two boards with Picaxes are in seperate boxes. The one IR receiver would be in...

I am having to use 2 Picaxe IC's in a project in order to get enough inputs and outputs. A 20M2 qnd a 14M2. The 20M2 has a remote control IRIN input to program functions. However my other Picaxe (14M2) has also to respond to IRIN input. The two boards are not next to another, so I am stuck as...