I'm posting this for the benefit of korttoma, because he's a Hero member who asked for it. It's an interstitial board for a 3.3V 8Mhz Arduino Pro Mini and an RFM69HW and an Si7021 TH or BME280 THP breakout board. Here's a photo of what it looks like: https://forum.mysensors.org/uploads/files/1476660793260-promini.jpg I recommend you remove the LED that's on Pin 13 of your Pro Mini, which you can do either by desoldering it or even just thoroughly scraping it off with a knife.
The current version is version 015.
Please order your PCBs for this project using the following link: https://PCBs.io/share/r3Xj5 . It is a more convenient way for you to order, and I will receive a 10% credit on my future PCB orders, whicAh contributes toward new development and improvements. This does not cost you anything extra, and the pcbs.io prices are lower than OSH PRK's.
|Qty||Value||Device||Package||Parts||Description||MF||MPN||Aliexpress or Ebay link|
|1||GY-21or GYBMEP||4pin I2C Si7021 or BME280 TH sensor breakout board|
|15||female header pins||2.54mm pitch (same as 0.1" pitch)|
|15||male header pins||2.54mm pitch|
|1||fabbed PCB||zipped files attached|
|1||wire||1 piece of wire of the appropriate length for the antenna|
|1||Arduino Pro Mini|