Super simple transmitters/receivers? - Page 1
Forum section: electronics / beginners

author: Fad Gadget
author_rank: Newbie
timestamp: November 04, 2015, 02:10:25 pm
content: Hi guys, my first post hereI’ve been contemplating a small circuit that transmits a short range signal/pulse to be received in the other end by another circuit. To simplify; you push a button and trigger some other circuit wireless 3 - 8 feet away. Now to the challenge; the button should either use a small 3V coin cell battery (or possibly use a piezo element) to drive its transmitter. The receiver unit must be able to pick up the signal/pulse and trigger a simple switch circuit.I’ve been toying with a single IR-led which works if you only have one receiver. However, I want to have at least two transmitters/receivers in the same room working individually and they can’t interfere with each other. Would it be possible to simply code the IR pulse like a TV remote or are there better ways?I know there are some very simple radio transmitters using only a transistor + r/c networkhttp://circuit-zone.com/?cat=fm_transmittersbut is there something even simpler? For example, would it be possible just to use a tiny low power crystal oscillator for transmitter? Maybe use different frequencies to separate signals?Basic requirements: Low power, very few components, short range transmit.I’m stuck atm but I’m sure this could be solved in some way. Any help highly appreciated!Cheers/M

author: LDM
author_rank: Contributor
timestamp: November 04, 2015, 03:10:49 pm
content: Easiest may be to buy onehttp://www.amazon.com/Channel-Wireless-Controller-Electronics-Power/dp/B00EQB8O7KIf you're looking to build it yourself, there are a number of kits or projects in magazines...https://www.quasarelectronics.co.uk/Category/kits-modules-remote-control

author: Pack34
author_rank: Frequent Contributor
timestamp: November 04, 2015, 03:45:39 pm
content: If you just care about pulses, look at an xBee. It's provides a really simple UART and digital I/O wireless link. Almost completely hands-off.Another good choice are Nordics nRF24 modules. You lose the simple digital I/O but they're cheaper.

author: Dagon
author_rank: Regular Contributor
timestamp: November 04, 2015, 04:30:20 pm
content: If you want really cheap and nasty have a look at this type of module:http://www.ebay.co.uk/itm/5X-New-433Mhz-RF-Transmitter-Module-And-Receiver-Link-Kit-For-Arduino-ARM-MCU-WL-/400676807597?hash=item5d4a32e3ad:g:~joAAOxy3HJTH~xDSome info here on them:http://www.romanblack.com/RF/cheapRFmodules.htm

author: Fad Gadget
author_rank: Newbie
timestamp: November 04, 2015, 04:58:41 pm
content: Good stuff guys! Got me thinking if there might be any monolith RF chips with onboard antenna and crystal out there. I know there are RFID stuff but I really need a tiny receiver solution. Hm...

author: edavid
author_rank: Super Contributor
timestamp: November 04, 2015, 06:08:45 pm
content: Just buy a wireless doorbell that has the kind of transmitter button you like.

author: Fad Gadget
author_rank: Newbie
timestamp: November 05, 2015, 10:35:56 am
content: Great idea edavid! Googled and found thishttp://www.talkingelectronics.com/projects/WirelessDoorbell/WirelessDoorbell.html.Cheers /M