Raspberry Pi Electricity Monitor

How and why I built a system for monitoring the electricity consumption of my home with a Raspberry Pi. Full details at http://unop.co.uk. Check out http://shutdownscanner.com (a service for automatically monitoring how many computers have been left on out of hours)

Transcript

1. Raspberry Pi Electricity Monitor Reverse Engineering Serial Data Protocols James Singleton unop.co.uk
2. Maplin • £13 • Download data feature • www.maplin.co.uk/wireless-electricity-monitor-611581
3. Looks like this... • Windows only (and not very good) • PC power consumption negates benefit
4. And this...
5. And this...
6. And this...
7. And sometimes like this...
8. That makes socket sad
9. Linux • Windows requires a driver install • And it's buggy (causes BSOD) • USB serial driver included on Raspbian • Just plug it in • And you can talk to the device
10. That makes socket smile
15. How • That's the why and the results • You can read about the rest of the results online • But how would you go about making generic hardware work on another OS? • Methods and tools • RS232 hackery
16. Sniff the data
17. 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:
18. 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:
19. Reimplement • Poll • Extract value • Compress • Save • Host • Graph • Cron tail • Digital sign (local or remote)
20. Future improvements • Use a DB (SQLite) • Post to online API • Combine with pricing data • Calibrate against meter • Combine with plug in meter for voltage • An app!
21. The plug • I've got a startup • Shutdown Scanner • Service to automatically measure how much power/money is wasted by inactive computers left on over night or at weekends • ShutdownScanner.com • Lots more graphs
25. Thanks