[PCB] Pro mini / RFM95W / 18650 solar chargeable

Got 2 of these boards graciously sent to me by the Author some month ago for testing.
I wanted to test them but did not had time yet, shame on me, I really need to test them :wink:

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Maybe you looked at the first link that I posted (of the AVR in stead of LORA node, sorry about changing the link) I think the used LoRa module (Semtech SX1276) is +20dB isn’t it?

If I look at https://www.semtech.com/products/wireless-rf/lora-transceivers/SX1276, it says that it has LoRa modulation. But since you are an obvious LoRa expert, and I am not, please tell me where I am wrong.

For the LoRa 868MHz, they actually use the RFM95W-868S2

Yes, I had watched the AVR version. The Lora version is great !! :slight_smile:

Do yo plan to release/share the PCB design for your board?

I received it today. Looks very nice, in particular that you added the ground plane below the rfm. I’ll order some components and then I’ll post an update.

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received today a well documented gift. Thanks @Wijnand
now it’s soldering time :sunglasses:


soldered, up and running
and already some ideas :wink:


Hi Wijnand,

Do you still have a pcb’s available? If so, I would like to receive one

Kind regards,

I am also very interrested in such a board. Would you publish the schematics here or somwhere else?

I recieved fine PCB from @Wijnand.


Pictures follows.


Hi @All

So i know @Wijnand would share his PCBs. He let us know: What's your experience with pcbs.io?

Something goes wrong with his account. I don`t know how to help. New owner of pcbs.io is https://www.makerbright.com/ ?

Is that the solution to get in contact to solve the problem?


I uploaded the design to pcbs.io again and that works.


Hey @Wijnand cool! :slight_smile:

Are you sharing? And show a link to the PCB?


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For better use of the battery it could be used the MCP1700-300 (3 V output) or MCP1700-280 (2.8V output) to take into account the dropout voltage.
MCP1700 typical dropout voltage is 178 mV and maximum 350 mV at 25°C and load 250 mA.

Hello Mario

Great work!

One thing: I always try to avoid the linked battery holder in your blog, this spring version is very bad, maybe this is not a real issue at those low power applications, but the contact between the springs and the battery is very poor. I therefore always use some massive battery holders, like this one: https://www.aliexpress.com/item//32691749341.html

Where can we order the boards?
If you could share the files for the 3D case would be great! I could also print some if someone from Switzerland is interested in the case and doesn’t have a printer.

Thank you!

Hello my friend!
Theoretically, I can share the plans, but I’m currently working on version 2. This will be completely open hardware and so I can upload them on various platforms.
I hope you have a little patience;)

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Is there anyone with experience with the CC1310? My new design (a VT-s02c module from Vincent Tang/China equipped with a CC1310 from Texas Instruments) is the next step to go to an IoT node supporting services for 10 years with a CR2032 coin cell battery (see for the concept: http://www.ti.com/tool/TIDA-00484). You can find the PCB at https://PCBs.io/share/rG9GP. Not tested yet!!!

Do those modules support LoRa modulation? The only references I found mention it supporting a modulation similar to LoRa.

First (after I recieved the PCB’s) I am going to test the power concept of TI. Next step to test the HF. I just read “no LoRa support”, see: http://e2e.ti.com/support/wireless_connectivity/proprietary_sub_1_ghz_simpliciti/f/156/t/611585