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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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+
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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
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