added link to random number generator
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@ -6,7 +6,9 @@ It uses our HelTec Wireless Stick. This - of course - can be replaced by a cheap
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Power Measurement is done by a SCT013 clamp (100A:50mA).
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## Used materials
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## Build the hardware
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### Used materials
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* ESP32 module (e.g. Heltec Wireless Stick)
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* 3 x SCT-013-100 (100 A), see: http://openenergymonitor.org/emon/node/156
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@ -62,9 +64,9 @@ R3 is the burden resistor. Ideal burden would be 19 Ω. As this is not a common
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See the Fritzing file for [details](./energy-monitor/energy-monitor.fzz).
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### Code
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## Code
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#### Print to serial out
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### Print to serial out
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Start with a simple code that just prints the values. The code is quite simple, as we can use the existing *[EmonLib libary V1.1.0 by OpenEnergyMonitor](https://docs.openenergymonitor.org/electricity-monitoring/ct-sensors/)*.
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@ -88,9 +90,9 @@ The code just prints the current power consumption to serial out:
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16:28:23.289 -> 400.62 Watt - 1.74 Ampere
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16:28:24.367 -> 94.42 Watt - 0.41 Ampere
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```
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#### Post to MQTT
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### Post to MQTT
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##### Boot up MQTT
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#### Boot up MQTT
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First, boot your local server infrastructure:
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@ -98,7 +100,7 @@ First, boot your local server infrastructure:
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docker-compose --file software/container/docker-compose.yml up
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```
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##### Credentials
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#### Credentials
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To connect to your Wifi and access your MQTT server you have to add this to an `environment` [header file](./02-energy-monitor-mqtt/environment.h):
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@ -115,7 +117,7 @@ The `mqtt_server` in tis example posts to my local IP adress. The Wifi network i
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The `mqtt_prefix` should be different per device, as this is the topic prefix used to identify the device.
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#### Testing
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### Testing
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You can subscribe to your local MQTT server and subscribe to all or just the interesting topics:
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@ -125,7 +127,7 @@ mosquitto_sub -h localhost -t '/iot-platform/energy-monitor/test-device/ampere'
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mosquitto_sub -h localhost -t '/iot-platform/energy-monitor/test-device/watt' -p 1883 #power
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```
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##### Interesting code blocks
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### Interesting code blocks
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Posting to MQTT is quite simple. After setting up Wifi and connection to the MQTT server, it's just a few lines of code:
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@ -136,6 +138,10 @@ Posting to MQTT is quite simple. After setting up Wifi and connection to the MQT
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Have a look at the complete [example](./02-energy-monitor-mqtt/).
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## Simulator
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If you just need random inputs (without using the actual hardware), you can simply modify my short [shell script](./00-simulator/).
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## Links
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* A very comprehensive project to build an energy monitor can be found in the [ESP32 + ESPHome Open Source Energy Monitor project by Daniel BP](https://github.com/danpeig/ESP32EnergyMonitor).
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