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Raspberry Pi Electricity Monitor
Reverse Engineering Serial Data Protocols
James Singleton
unop.co.uk
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Maplin
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£13
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Download data feature
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www.maplin.co.uk/wireless-electricity-monitor-611581
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Looks like this...
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Windows only (and not very good)
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PC power consumption negates benefit
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And this...
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And this...
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And this...
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And sometimes like this...
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That makes socket sad
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Linux
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Windows requires a driver install
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And it's buggy (causes BSOD)
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USB serial driver included on Raspbian
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Just plug it in
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And you can talk to the device
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That makes socket smile
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How
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That's the why and the results
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You can read about the rest of the results online
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But how would you go about making generic
hardware work on another OS?
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Methods and tools
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RS232 hackery
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Sniff the data
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The data
0 0.09933916sems.exeIRP_MJ_CREATE ProlificSerial0 SUCCESS Options: Open
1 0.00001928sems.exeIOCTL_SERIAL_SET_QUEUE_SIZE ProlificSerial0 SUCCESS InSize: 2500 OutSize: 2500
2 0.00000559sems.exeIOCTL_SERIAL_GET_BAUD_RATE ProlificSerial0 SUCCESS
3 0.00000419sems.exeIOCTL_SERIAL_GET_LINE_CONTROL ProlificSerial0 SUCCESS
4 0.00000391sems.exeIOCTL_SERIAL_GET_CHARS ProlificSerial0 SUCCESS
5 0.00000391sems.exeIOCTL_SERIAL_GET_HANDFLOW ProlificSerial0 SUCCESS
6 0.00000391sems.exeIOCTL_SERIAL_GET_BAUD_RATE ProlificSerial0 SUCCESS
7 0.00000363sems.exeIOCTL_SERIAL_GET_LINE_CONTROL ProlificSerial0 SUCCESS
8 0.00000363sems.exeIOCTL_SERIAL_GET_CHARS ProlificSerial0 SUCCESS
9 0.00000363sems.exeIOCTL_SERIAL_GET_HANDFLOW ProlificSerial0 SUCCESS
100.05133837sems.exeIOCTL_SERIAL_SET_BAUD_RATE ProlificSerial0 SUCCESS Rate: 9600
110.00038217sems.exeIOCTL_SERIAL_SET_RTS ProlificSerial0 SUCCESS
120.00098141sems.exeIOCTL_SERIAL_SET_DTR ProlificSerial0 SUCCESS
130.00094090sems.exeIOCTL_SERIAL_SET_LINE_CONTROL ProlificSerial0 SUCCESS StopBits: 1 Parity: NONE WordLength: 8
140.00003269sems.exeIOCTL_SERIAL_SET_CHAR ProlificSerial0 SUCCESS EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13
150.00000503sems.exeIOCTL_SERIAL_SET_HANDFLOW ProlificSerial0 SUCCESS Shake:1 Replace:40 XonLimit:2048 XoffLimit:512
160.00000810sems.exeIOCTL_SERIAL_PURGE ProlificSerial0 SUCCESS Purge: TXCLEAR RXCLEAR
170.00000447sems.exeIOCTL_SERIAL_SET_TIMEOUTS ProlificSerial0 SUCCESS RI:20 RM:20 RC:20 WM:20 WC:3000
180.00000503sems.exeIOCTL_SERIAL_GET_COMMSTATUS ProlificSerial0 SUCCESS
190.00086547sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: ....
200.03268125sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 8: ........
211.30080499sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
220.00082832sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: ....
231.30087539sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
240.00047604sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: ....
250.07094952sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: S01....2S0222..1S03....2S04....2S05....2S06....2S07....2S08....2
260.06694426sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: S09....2S10....2S11....2S12....2S13....2S14....2S15....2S16....2
270.02160247sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 1: .
281.30083293sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
290.00047799sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: ....
300.05098469sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: S01DAY..........................................................
310.06696158sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: ......................MON.......................................
320.03139673sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 10: ..........
331.30079717sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
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Hex
190.00088894sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: AA 00 00 AD
200.03275919sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 8: AA F0 00 AD 01 00 01 00
211.30085695sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
220.00095264sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: AA 01 00 AD
230.05059023sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 53 30 31 44 41 59 07 00 08 00 08 00 08 00 0C 0
240.06584636sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 06 00 07 00 09 00 08 00 09 00 0C 00 0E 00 08 0
250.03186327sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 10: 00 00 00 00 00 00 00 00 00 11
261.30084215sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
270.00109204sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: AA 02 00 AD
280.06994297sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 53 30 31 FF FF 00 00 32 53 30 32 32 32 13 08 3
290.06694873sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 53 30 39 FF FF 00 00 32 53 31 30 FF FF 00 00 3
300.02180892sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 1: F9
311.30084885sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
320.00063863sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: AA 01 00 AD
330.05113499sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 53 30 31 44 41 59 07 00 08 00 08 00 08 00 0C 0
340.06591955sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 06 00 07 00 09 00 08 00 09 00 0C 00 0E 00 08 0
350.03220409sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 10: 00 00 00 00 00 00 00 00 00 11
361.30084410sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
370.00054309sems.exeIRP_MJ_WRITEProlificSerial0 SUCCESS Length 4: AA 02 00 AD
380.07091544sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 53 30 31 FF FF 00 00 32 53 30 32 32 32 D2 07 3
390.06695292sems.exeIRP_MJ_READ ProlificSerial0 SUCCESS Length 64: 53 30 39 FF FF 00 00 32 53 31 30 FF FF 00 00 3
400.02219137sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 1: B7
411.30084717sems.exeIRP_MJ_READ ProlificSerial0 TIMEOUT Length 0:
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Reimplement
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Poll
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Extract value
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Compress
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Save
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Host
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Graph
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Cron tail
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Digital sign (local or remote)
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Future improvements
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Use a DB (SQLite)
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Post to online API
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Combine with pricing data
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Calibrate against meter
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Combine with plug in meter for voltage
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An app!
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The plug
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I've got a startup
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Shutdown Scanner
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Service to automatically measure how much
power/money is wasted by inactive computers
left on over night or at weekends
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ShutdownScanner.com
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Lots more graphs
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Thanks