Home power consumption measuring unit
This module was given to a friend many years ago.
You need a light sensor that registers LED flashes from your house power consumption unit. In Norway we have a unit that emits a LED flash every X kW. This sensor connects to the module. The consumption is measured in kW and calculated by counting the number of pulses and divide by 500 (500 pulses pr. kW). The registration will continue as long as the module receives a signal from the light sensor, the used amount can then be read using serial communication from the computer.
Two values are stored, current and present usage. By sending a command to the module the current value can be moved to the previous, thus making it possible to compare periods. Current usage value is deleted when moved to previous. These values are stored in EEPROM every hour, and is used when the module start up from e.g. a power loss. That means that you could lose one hour of monitoring. You can also enter a desired start usage value.
Before any EEPROM values are stored the module will display -1 kW current and previous usage. There can be reset by moving current to previous two times (command 4). Correct EEPROM values will then be stored one hour after first received signal.
2,5 mm, 9-12V=, positive center.
- 6 : 5V + out
- 7 : 5V - out
- 8 : 5V + sensor in
- 9 : 5V - sensor in
- 2 : Transmit
- 3 : Receive
- 5 : GND
Forbruksmaaler v.1.0 JensenCorp 0704001 Press 0 for help 1 - Current usage 2 - Previous usage 3 - Enter starting point 4 - Move current to previous Current usage will be deleted! (0 to cancel) Enter starting point in kW : 100 100 kW saved 100 kW current usage (50000 pulses) 100 kW moved to previous 100 kW previous usage 0 kW current usage (0 pulses)
- Data bits
- Stop bits