BUY
This circuit allows many uses :
It runs from battery. There is a CR2032 holder on bottom, but it can also be powered with 2xAA batteries, on a separate header.
You can also directly provide the 3.3V on another header.
There is 2 inputs : both have pull-ups pads to solder a resistor, but are optionnal (if you prefer to use atmega internal resistor).
The power stage uses a MAX1724EZK33+, which converts input voltage from 0.8V to 3.3V to fixed output of 3.3V.
The radio module used is a RFM69(HW). I also made a very similar version for the RFM69HCW, because HopeRF did a mistake and sold me 50pcs of the wrong radio module ;). It uses almost the same components, except I removed the boost converter.
Circuit size is 50x30mm, which is about the same size of 2xAA batteries. You can the place it almost everywhere !
**Component selection ** There is different ways to power this device :
Programming Warning ! The board isn't drilled big enough to use standard ICSP headers ! Instead, I made a simple adapter with pogo pins (pictures coming soon). Just hold the adapter with a hand firmly on the board, and hit "upload" with your second hand. You'll also need an USBASP or equivalent programmer (no USB adapter on the board !)
** Usage ** You can use the device multiple ways :
Qty | Value | Device | Package | Parts | Description | MF | MPN | Aliexpress or Ebay link |
---|---|---|---|---|---|---|---|---|
1 | ATMega328p | TQFP32 | ||||||
1 | RFM69HW | Or RFM69W if you don't care about high power. | ||||||
6 | Pogo Pins | to use ICSP ! | ||||||
1 | AMS1117 | ...or equivalent, if you plan to supply more than 4.5V | ||||||
1 | MAX1724EZK33 | if you plan to power with less than 3V | ||||||
1 | 1206 inductor 10uH | if you plan to power with less than 3V | Ebay: https://www.ebay.fr/splashui/challenge?ap=1&appName=or... | |||||
1 | CR2032 holder | if you plan to power with a coin cell | Ebay: https://www.ebay.fr/splashui/challenge?ap=1&appName=or... |
Name | Size | # Downloads |
---|---|---|
MultiUse_Battery-Edge.Cuts.GML | 566 B | 396 |
MultiUse_Battery.TXT | 575 B | 388 |
MultiUse_Battery-F.Mask.gts | 2.92 kB | 517 |
MultiUse_Battery-B.Mask.gbs | 1.03 kB | 471 |
MultiUse_Battery-B.SilkS.gbo | 3.5 kB | 464 |
MultiUse_Battery-F.SilkS.gto | 15.17 kB | 416 |
MultiUse_Battery-B.Cu.gbl | 21.44 kB | 414 |
MultiUse_Battery-F.Cu.gtl | 55.83 kB | 474 |
MultiUse_Battery.kicad_pcb | 89.5 kB | 493 |
MultiUse_Battery.sch | 8.93 kB | 520 |
MultiUse_Battery.net | 15.61 kB | 456 |