Introduction: Esp8266-12 Blynk Wireless Electric Power Meter
this project is to measure the electricity consumption in my Home and show on my smartphone or tablet.
It is very cheap and simple to make.
This second project perfectly complements with:
ESP8266-12 standalone blynk control outlets wireless 433 mhz
the next step will be to combine the two projects and create an automated home
Step 1: Materials
ESP8266-12
Attiny85
LDR
10 k resistor
power regulator 3,3v
Step 2: Connections
ESP8266-12
VCC +3,3v
CH_PD +3,3v
GND ground
gpio5 ground
gpio2 ---- pin 5 (Attiny85)
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Attiny85
pin 1 nc
pin 3 ---- sensor LDR
pin 4 ground
pin 5 ------ gpio2 (ESP8266-12)
pin 8 +3,3v
Step 3: LDR Sensor
- connect the sensor LDR as in the diagram
- attach the sensor with hot glue or adhesive tape in front of the LEDs of the electricity meter
- if the electricity meter is lit from the sun or lights, you can shield using a black cardboard
- adjust the sensitivity of the sensor in the sketch, so as to detect only the impulse of the LED of the electricity meter. ( step 5)
Step 4: Configure Blynk
store app
configure blynk
create new project ( use hardware model esp8266 )
generate AUTH TOKEN
send E-mail TOKEN ( copy TOKEN in the esp8266 sketch)
in the app Blynk use Value Display widget or Gauge widget
Step 5: Sketch
Library
Blynk library
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to programming the ESP8266-12, I use ide arduino 1.6.5 and CP2102 3.3V USB To UART Serial Interface Module Adaptor ( do not connect the power of the CP2102 to esp8266-12).
to programming Attiny85 I use ide 1.6.5 and Arduino uno (Arduino as ISP).
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the electric meter emits 1 led pulse for every watt that measure
ATtiny85 detects the Led pulse using a sensor LDR
send to interrupt input of gpio2 ESP8266-12
sketch calculates the elapsed time between two pulses and calculates the power consumption, and displays it on the app Blynk.
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attiny85 sketch
adjust the sensitivity of LDR sensor ( I use low sensibility and protect from light with the black cardboard)
if (FotoR <=200) // LDR sensor, change sensibility
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ESP8266 sketch
change the sketch in the following lines with your data
char auth[] = "xxxxxxxxxx"; //insert here your token generated by Blynk
Blynk.begin(auth, "ssid", "password!"); //insert here your SSID and password
esp8266-12 gpio pin
the interrupt pin is the same as the gpio pin
if you want to change the pin, not use gpio16 or pin ADC, because it is not an interrupt
all gpio pin are interrupt (excluded gpio16 and ADC)
Step 6: Thanks
Thanks by catoplepa
