Got my wedge tip (bad quality, night get a decent one instead) for my soldering iron and had a quick go at desokdering and resokdering a connection. Definitely seemed easier and quicker than the pointy one.
Had a play with my Arduino last night and made a LED flash. Woo :D
Perhaps for the same reason that you wrote "night" instead of 'might', and "desokdering and resokdering" instead of 'desoldering and resoldering'. Spill awtocorekt.
I was going to edit my last post but when I tried I got a blank post without what I had already written.
If I connect one of the output pins to ground and put the ground from the Arduino to one of the colour pins on the LED module the LED lights. That doens't seem right.
I've also just realised that I was probably running the LEDs with to much current. I had connected the resistors in parallel instead of series in the circuit. Oops.
How can I get two arduinos to communicate wirelessly?
I have an idea for sommat which would need two (maybe three (or you could use more I guess)) to talk to each other. Only have 1 Arduino at the mo anyway so can get the first bit working at least.
Probably a couple of metres. I will look at Xbees.
I've seen wireless serial RF devices or WiFi modules on eBay. Wouldn't mind which type, just need to send a signal from one to the other. Could WiFi ones connect together or would it need to go through router?
Only used Xbees for simple serial point to point stuff, I don't really know the differences between the umpteen different versions. They're meant for mesh networking so I imagine it could do it peer to peer.
Have a look at nRF24L01+ adapters. Really cheap on ebay. You can get ones with a tiny onboard antenna (99p) or slightly more expensive ones with a bigger screw-on antenna (~£3).
Edit : If you want to buy some on ebay the cheap ones come from China/HK. Also, since you want more than one search for something like "nRF24L01 -1pcs pcs" to get some good prices for multiple adapters.
Yeah, they're supposed to get some pretty impressive transmission distances.
I've got one with a massive antenna connected to a Raspberry Pi and a couple of arduinos with the tiny antenna adapters around the house transmitting temperatures. It might be because mine are indoor with decent thick walls but I've definitely seen some range issues. It could also be 2.4 GHz interference. I imagine in an open space you'd get great range.
It does say unobstructed. The ones with the small antennas don't seem to mention range. Our house is a mix of plasterboard upstairs and brick downstairs.
I haven't had 2 arduinos communicating with them (because that wasn't my aim) so I can't say if that's easy.
Getting them to communicate with the RPi wasn't too easy. IIRC the arduino side of things was fairly easy but the RPi wasn't straight forward, I had to email the person who wrote some examples for advice, I was clueless with what I needed to do.
The arduino side of my setup is pretty "dumb", all it does is transmit a payload of the temperature and another number every 10 seconds or so. It was getting the RPi to receive them that was harder.
You're probably best getting a couple, using some example sketches and getting something working, then adapt it to what you want to actually do.
Ah, Arduino to Pi, I see. Hopefully it will be easier Uno to Uno. Which cheap Arduinos did you buy? Was it the little mini ones from eBay?
Had a play with the 2 line LCD in the kit last night. Made a scrolling display (autoScroll only seemed to scroll both lines) and realised the pot for the contrast is definitely needed which may explain why my 4 line didn't show anything with the Pi, it may actually have been working.
Also any idea about debugging sketches? I put too many for loops inside my scrolling display code. Took a while to work out what I'd done.
bastard by name