This is a PCB for all beginners who want to quickly build the nodes described in the MySensors website! It can be used with regulated power or batteries and only have basic components. Its a PCB for all newbies that want to do basic sensor/actuator nodes like myself out there... :)
This is the RFM69(HW/W) edition of EasyPCB! If you want the original EasyPCB with Nrf24l01+ transiever - go here.
So pretty much this PCB covers all the basic stuff documented in the MySensors website! This cuts my work with one node from a couple of hours (soldering wires) to 20min.
Only easy to solder components with good space in between. Only basic functions (Pro Mini 3,3v, Radio, Input for sensors and if battery powered booster and voltage divider) Some inputs for all the normal sensors used in the build section. 5x5 or 3x5 depending on function and dynamic in what power you use (Battery, 3.3v or >3.3v (requires voltage regulator). Note, this edition can only handle Pro Mini 3.3v and NOT 5v
Power consumption (without booster) in MySensors sleep() mode (Ver 2.2) was measured to 5,2uA which will last a node (depending on how often it transmits) a long time!
3x5cm (cut PCB)
Only the lower capacitor marked 0.1uF affects the RFM69 module! The capacitor marked 10uF only affects the input of the voltage regulator.
3x5cm (cut PCB)
3x5cm (cut PCB)
To be able to achieve this you need to reprogram the atmega bootloader/fuses and lower the BOD!
With REG closed you will feed everything (Arduino, Radio and Sensors) with whatever voltage the battery holds. You can´t use any sensors which require higher voltage than the current battery status (without using a DC/DC Step up booster for the sensor). With this configuration, you can measure VCC supply level without external components [Library]. Lowest working voltage (depending on added sensors) will probably be the RFM69w module which can handle down to 1.8v. Do not use any DC/DC step-up booster or voltage regulator to feed the Arduino or radio!
To lower BOD you can use standard Pro Mini bootloader and change boards.txt. See here for instructions.. This will give you some more battery (down to 2.2-2.4v?) but use the 8mhz external crystal at lower voltages will be risky (at least at 1.8v, radio minimum) so it might be a good idea to run a bootloader @ 1mhz internal oscillator.
You need to attach an antenna to the board. The antenna needs to be single core inside, not multi-wire like you can find in common dupont cable. Aside from not working without an antenna, transmitters can be damaged if they transmit without an antenna present. For this PCB you can either attach an SMA connector and buy an antenna with that connector or make do it yourself. There are a lot of tutorials out there, and for 433mhz I suggest this tutorial.
BAT: Short this if you are using batteries as power supply. It will activate booster circuit and power everything with a stable 3.3v. Make sure you have a corresponding DC/DC step-up booster to match your batteries to 3.3v
REG: Use this if you are using 3.3v regulated DC.
RAW: This is a MysX feauture. This cuts onboard Vraw source if daughterboard provides Vraw. This is only used when EasyPCB is connected to a daughterboard.
Rev 9 - RFM69 Edition
20/7-2017 This PCB is still under development and testings! It's far from finished and confirmed working
Order 10pcs: Openhardware.io (Recommended!) and support me and MySensors! (It may say another rev. at the order page but this is not EasyPCB rev but the rev for manufacturer. I always update the Gerber files for sale! Current = Rev 9)
Download from this page to get KiCad and Gerber files.
If you want a faster shipping time or fewer pieces you can order from me on Ebay.
|1||Arduino Pro Mini||3.3v 8mhz||Only 3,3v!||https://www.mysensors.org/store/arduinos|
|1||DC/DC Step up booster||In: 0.8 – 3.0 Out:3.3v||Used if you power with batteries||https://www.mysensors.org/store/regulators|
|1||Voltage regulator||5v to 3.3v||If you input 5v. (You may change this, but it needs 3.3v out!||https://www.mysensors.org/store/regulators|
|1||RFM69 H or HW module||H or HW||The radio!||https://www.mysensors.org/store/radio|
|1||Antenna with SMA connector||Should match your freq on the radio||For the maker you can diy an antenna.||https://www.mysensors.org/store/radio|
|1||Capacitor throughhole||0.1uF||C1 – if you are using booster (optional, good with cheramic)||https://www.mysensors.org/store/components|
|1||Capacitor throughhole||0.1uF||C2 – supports volt regulator and power to radio||https://www.mysensors.org/store/components|
|1||Capacitor throughhole||10uF||C3 – if you are using voltage regulator||https://www.mysensors.org/store/components|
|1||Capacitor throughhole||0.1uF- Optional||C4 – If you are using voltage divider to measure battery level.||https://www.mysensors.org/store/components|
|1||Resistor throughole||10k - Optional||R1 – This is a pull-up resistor for D3||https://www.mysensors.org/store/components|
|1||Resistor throughole||470k – Optional||R2 – If you are using voltage divider to measure battery level||https://www.mysensors.org/store/components|
|1||Resistor throughole||1M – Optional||R3 – If you are using voltage divider to measure battery level||https://www.mysensors.org/store/components|