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@@ -2,6 +2,7 @@ Roving RN-42 |
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============ |
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07/16 After fix of voltage dividor on GPIO6, had a trouble that it could not send a char to BT module, though could receive. |
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Found R8 had wrong 1K resistor and changed to 10K, after that it can send to the module again. Not sure how it had sent with the wrong 1K before. |
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07/18 On Linux, had an USB related trouble; keyobard or console didn't work for some reason. Changing PID cured this problem. Very annoying, took very long time before resolved it. |
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@@ -28,6 +29,28 @@ DONE: |
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- Power selector doesn't work; Q4 MOSFET leaks from Lipo to USB power line. -- use Schottky instead 07/04 |
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Lipo |
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---- |
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Sparkfun Polymer Lithium Ion Battery 850mAh: |
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https://www.sparkfun.com/products/341 |
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Lipo Cell spec: |
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https://www.sparkfun.com/datasheets/Batteries/063048%20Li-polymer.pdf |
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Protection spec: |
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http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/BatteryProtection.pdf |
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min typical max |
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over-charge 4.255 4.280 4.305 |
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over-charge discover? 4.030 4.080 4.130 |
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over-discharge 2.827 2.900 2.973 |
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over-discharge discover 3.022 3.100 3.178 |
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ADC voltage monitor: voltage divider 10K+10K(0.5) |
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ADC=V*0.5/2.56*1024 |
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V ADC |
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------------------ |
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4.20 0x347(839) |
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3.10 0x26b(619) |
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Configuration |