Arduino - Teh Forum

From:	Chris (CHRISSS)	3 Jan 2015 18:51
To:	ALL	107 of 542

40898.107
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. Me

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From:	koswix	3 Jan 2015 20:40
To:	Chris (CHRISSS)	108 of 542

40898.108 In reply to 40898.107

What sort of distance? Xbees have a good reputation I think.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	Chris (CHRISSS)	3 Jan 2015 20:50
To:	koswix	109 of 542

40898.109 In reply to 40898.108
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? Me

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From:	koswix	3 Jan 2015 21:15
To:	Chris (CHRISSS)	110 of 542

40898.110 In reply to 40898.109

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.


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If Feds call you and say something bad on me, it may prove what I said are truth, they are afraid of it.

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From:	ANT_THOMAS	3 Jan 2015 22:29
To:	koswix Chris (CHRISSS)	111 of 542

40898.111 In reply to 40898.107
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. ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	3 Jan 2015 22:59
To:	ANT_THOMAS	112 of 542

40898.112 In reply to 40898.111
Those are the ones I saw on eBay earlier. I think I will look into how they work. Thanks. Apparently the screw on aerial types can transmit up to 1km. Long far. Me

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From:	ANT_THOMAS	3 Jan 2015 23:03
To:	Chris (CHRISSS)	113 of 542

40898.113 In reply to 40898.112
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. ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	3 Jan 2015 23:35
To:	ANT_THOMAS	114 of 542

40898.114 In reply to 40898.113
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. Are they easy to use? Me

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From:	ANT_THOMAS	4 Jan 2015 00:14
To:	Chris (CHRISSS)	115 of 542

40898.115 In reply to 40898.114
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. ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	4 Jan 2015 11:10
To:	ANT_THOMAS	116 of 542

40898.116 In reply to 40898.115
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. Me

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From:	ANT_THOMAS	4 Jan 2015 11:44
To:	Chris (CHRISSS)	117 of 542

40898.117 In reply to 40898.116
There's two types of the cheap small arduino clones about. There's the Nano and the Pro Mini. I've got some of both but I much prefer the Nano type. They come with USB serial built in and possibly more pinouts, slightly larger and marginally more expensive I think. You can power over the USB connection too which is really useful because I've got a load of mini-USB phone chargers from old phones lying around. I believe you'll need a Nano for the nRF24 adapters because the Pro Minis I have don't have a 3.3V pin which is required. If I've still got a spare Nano I might make another wireless temperature sensor today for a different room. ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	4 Jan 2015 12:12
To:	ANT_THOMAS	118 of 542

40898.118 In reply to 40898.117
Cheers Ant. Helpul info there. There doesn't seem to be a huge difference in price between the cheapest minis and nanos. The USB socket does sound useful though. Some of the mini boards say switchable between 3.3V and 5V. How many Arduinos do you have? Me

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From:	ANT_THOMAS	4 Jan 2015 12:24
To:	Chris (CHRISSS)	119 of 542

40898.119 In reply to 40898.118
The minis require you to have a serial adapter of some sort to load sketches to it. Once loaded you don't need the serial adapter connected anymore but I found this to be a pain to get working first time every time. The USB nanos work first time, much less hassle. I have 4 in use and I think I bought 5 nanos and 5 pro minis a while back. ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	4 Jan 2015 13:36
To:	ANT_THOMAS	120 of 542

40898.120 In reply to 40898.119
That does sound easier. I'm sure I have a few mini USB leads around too. Just over £2 for an unsoldered board. I might order a couple of them and wireless modules and maybe some temp sensors too. If I had more time I could get carried away with these. Me

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From:	ANT_THOMAS	4 Jan 2015 13:50
To:	Chris (CHRISSS)	121 of 542

40898.121 In reply to 40898.120
Not sure if all mine came with USB cables but some I have bought did, I was fairly impressed since I was just expecting board and pins. ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	4 Jan 2015 15:06
To:	ANT_THOMAS	122 of 542

40898.122 In reply to 40898.121
About £2.80 for a nano with a cable. Cheap. People probably pay about 5 or 10 times that just for a USB cable in some shops. Me

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From:	Chris (CHRISSS)	5 Jan 2015 10:58
To:	ALL	123 of 542

40898.123
Things I have ordered so far: 2 nanos 4 wireless transceivers 1 real time clock 2 temp sensors Me

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From:	Chris (CHRISSS)	5 Jan 2015 11:42
To:	ALL	124 of 542

40898.124
One more question (for now): I can probably get my hands on quite a high capacity 18V Li Ion battery from an old cordless drill. How could I use that with an Arduino. External voltage regulator or sommat? Me

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From:	ANT_THOMAS	5 Jan 2015 11:58
To:	Chris (CHRISSS)	125 of 542

40898.125 In reply to 40898.124
Most Arduinos can take 6-20V on the Vin so you shouldn't need a regulator (there's one onboard). ┌─────┐ │ │ │ ┌─┐ │ │ │ │ │ │ └─┘ │ │ │ │ ┌─┐ │ │ │ │ │ │ │ │ │ └─┘ └─┘

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From:	Chris (CHRISSS)	5 Jan 2015 12:17
To:	ANT_THOMAS	126 of 542

40898.126 In reply to 40898.125
Both my SainSmart and the nanos say up to 12V. Me

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