I just now posted Version 2, which enlarges the through-holes a bit to make aligning pins easier. I also added all the Arduino pin names to the silkscreen.
@paul-robertson said in Compact nRF24L01+ Pro Mini Bottom Shield:
It's not obviou to me how to connect sensors, suggestions ?
What do you have in mind?
RFM69 and Ethernet shield share SPI bus, each one with its own CS line. Ethernet shield uses pin 10 so JP1 should use pin 6 for the radio. Issues sharing SPI bus seems to be due to bad SEN line handling as described here. The official Arduino ethernet shield suffered from this, but most commonly used clones work ok. Shields including 74LVC14 as in the pic should work ok.
Sorry, one more mistake. On the board, the UART port connector rotates on 180 degrees. In this case, UART on the Orange PI Zero and UART on the board should be connected with wires.
Thanks for the great design. I wonder if you could edit the design for new Hi-link 5V products (5V 5W HLK-5M05, 5V 10W HLK-10M05L, and 5V 20W HLK-20M05). They are very similar but different in size. Thank you.
Julien stumbled across an inexpensive PFM boost converter board which he demonstrates is able to boost 65mv up enough to light a red LED:
eBay Cheap & Cheerful: #3 - DC/DC Boost Module 5V Out – 07:44— Julian Ilett
I can't discern from the video what the minimum start-up voltage was, but it's quite a surprising finding anyway, because on its face it would appear to outperform most of even the energy harvesting chips on the market with respect to minimum operating voltage!
Edit: In a subsequent video, Julien found that the start-up voltage was 560mv (the datasheet only promises 0.9v as the minimum, so maybe Julien got lucky with his particular device):
Update: Cheap 5V Boost Converter Performance – 06:58— Julian Ilett
but he's able to keep it running (albeit with just a 1.2v output and little to no load) on what he says is an input voltage of as little as 10mv. That matters because by keeping it running it sidesteps the start-up voltage requirement, and if the input voltage rises it can start being useful much sooner than having to wait for a minimum 0.56v input voltage to be reached. What would be interesting to know is just how much power is required to keep it running, even if only just for this purpose.
The switching chip is the E50D, which Julien's research indicates may be a CE8301.
Project completed.
