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September 30, 2011
Formula 1 Software Analyst
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Assembler, C, Spin,
about 4 months ago
Looking at the schematic, the Vin input goes to a AP7215-33YG-13 voltage regulator through a shottky diode. The regulator has a maximum input of 5.5V, and the shottky diode will have a drop of around 0.2V. So max input is 5.7V absolute maximum.
To use a solar cell, add a buck/boost switching regulator with an output of 5V between it and the MKR1000 Vin pin.
Note: The minimum input voltage for the regulator is 3.4V to 3.55V depending on load current, so you will not get full use of a LiPo battery which has a range of 3.0V to 4.2V. You need to look at the characteristics of the cell you use to check how much capacity is available above 3.5V.
Hope that helps. Please correct me if I misinterpreted anything!
about 6 years ago
I have one that I sent display data to about 6 months ago and is still very clearly visible.
I had to write the display data several times to make it very dark: I use a sequence like the kindle display - I write the inverse of the existing data then all black then all white - this helps eliminate any ghosting of the previous display data. Then I write the new data a couple of times (with a rest in between of about 500mS) to build a strong contrast.
The fade rate is affected by temperature, do you have it very hot or very cold?
Finally got around to powering this up with the breakout board.
You can run black on white - just invert the BW, COM and data signals in the code.
(Since the COM and BW outputs of the driver chips on both display halves are connected internally you must drive these the same sense for both display halves or you will pull your supply down.)
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