[OpenTRV-dev] Useful IRC chat re H-bridge etc

[Mike Stirling]

That's a nice solution. Also don't forget that for applications where Vbatt == Vcc the battery voltage can be measured efficiently with no external components on AVR.
 
----------------original message-----------------
From: "Damon Hart-Davis" EMAIL ADDRESS HIDDEN 
To: "Closed list for developer discussions" EMAIL ADDRESS HIDDEN 
Date: Fri, 17 May 2013 11:15:48 +0100
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> Thanks.
> 
> Damon
> 
> 
> On 17 May 2013, at 11:05, Stuart Poulton wrote:
> 
>> The following from jcw is also of interest
>> 
>> http://jeelabs.org/2013/05/17/zero-powe-battery-measurement/
>> 
>> On 16 May 2013, at 22:30, Damon Hart-Davis wrote:
>> 
>>> DHD20130516: Useful IRC session about H-bridge direct motor drive, 
>>> including outline schematic from Mike (only needs two digital lines to 
>>> drive it) and notes about current monitoring and supply management.
>>> 
>>> 
>>> http://www.earth.org.uk/OpenTRV/circuitFragments/MS20130516-hbri
>>> dge-2wire.png
>>> 
>>> 
>>> http://www.earth.org.uk/OpenTRV/circuitFragments/MS20130516-hbri
>>> dge-2wire.txt
>>> 
>>> The neato thing there may be that Schottky diode + small super cap may 
>>> isolate the AVR from motor-induced voltage sags and with care may allow AVR 
>>> to maintain software RTC running while main batteries are swapped out. (I 
>>> can put TMP112 and RFM22 on other side of that diode if need be to get current 
>>> draw down to 1.3uA.)
>>> 
>>> Plus Bo has made enough space to possibly squeeze the actual H-bridge 
>>> components in! B^>
>>> 
>>> Rgds
>>> 
>>> Damon
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>> 
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