![]() ![]() ESP32-wroom-32 ESP32-S programming board and breadboard adapter. ![]() esp-12 esp-07 (esp8266) programming board and breadboard adapter.3D printed pins to use with nail to hang a picture.Herringbone gears for Cyclone PCB Factory.Improved Z Axis for Cyclone PCB Factory.3D Printed Modular Holder System: esp32-cam housing – 2.3D Printed Modular Holder System: basic elements – 1.FlyingBear Ghost 5 enclosure: top cover.FlyingBear Ghost 5 enclosure: front cover/door.ABB Aurora PV inverter library for Arduino, esp8266 and esp32.DHT12 i2c Cheap Humidity and Temperature Sensor.PCF8575 i2c 16 bit digital I/O expander.Send email with esp8266 (Library v1.x deprecated).Send email with attachments (v2.x library).DynamoDB with JavaScript SDK v2 and v3 Tutorial.Manage JSON file with Arduino, esp32 and esp8266.How to interface Arduino, esp8266 or esp32 to RS-485.How to reuse 4 and 6 wires stepper motors for your projects.GY-291 ADX元45 i2c spi accelerometer with interrupt for esp32, esp8266, stm32 and Arduino.Temperature and humidity sensors: how to and comparison.Alexa Connected Devices Smart Home Skill Tutorial.WebSocket on Arduino, esp8266 and esp32.How to create a REST server on esp8266 or esp32.How to create a Web Server with esp8266 and esp32.WeMos D1 mini (esp8266), the three type of sleep mode to manage energy savings – Part 4.How to use SD card with esp8266 and Arduino – 1.DHT12 temperature humidity on protected Web Interface with esp8266 or esp32.ATtiny Programmer Board (ArduinoUNO As ISP).Web Monitoring Station for ABB Aurora inverter (ex Power One now Fimer).LoRa wireless remote water tank and pump controller (ReWaL).Let’s look at a very basic example, blink a led for 1 second every 30 seconds.Īvailable on GitHub with more comment in the code along with two more extensive examples. Your ESP will boot just as it would if you just pressed reset. What I have done so far is just create all code in the setup function which than ends in ESP.deepSleep and a delay(1). One thing to note is that the code after ESP.deepSleep does not get executed. ![]() Once the timer has passed pin D0 will be pulled low for a short time, creating a reset. Please note that some ESPs will not upload if you have D0 connect to RST so you might have to remove it during upload.īasically what the function ESP.deepSleep does is sleep the specified amount of microseconds (not milliseconds, but 1 millionth of a second). To make this work, you only need to do two things, use the function ESP.deepSleep and connect GPIO16 (D0) to RST. This seems to even make sense, from a power usage perspective, if you have readings every minute. This assumes average usage of 80 mA and 20 second startup and post to API time. This means we will save over 96,5% of over power usage if we use deep sleep for 10 minute intervals. The power usage of the ESP during deep sleep is not zero of course but around 10 ♚ (1/1000 of a mA) which means that during the rest of the time, 83,520 seconds, it will consume a total of 0.232 mAh. This means during it’s on time it will consume 64 mAh (2,880 seconds * 80 mA / 3,600 seconds per hour). Let’s see, 24 (hours) * 6 (readings per hour) * 20 seconds = 2,880 seconds on during a day instead of 86,400 seconds per day. If we use deep sleep and wake it every 10 minutes (minus 20 seconds) we also have the same number of readings but from a power perspective we drop significantly. If we leave the ESP on for a full day, it will have consumed 24 hours * 80 mA which is 1,920 mAh. Let’s say we do a temperature reading every 10 minutes. I did some tests and I can connect to wifi, do a temperature reading and post it to ThingSpeak in less than 20 seconds. So, let’s first calculate why this is interesting. The catch is that it is actually off so you cannot wake yourself up. If your IoT is used to measure things, like temperature or daylight or is waiting for some time before doing something you can put your ESP to sleep for a period of time. ![]() A typical battery might give you a capacity of 1600 mAh, milliamphours, which at 80 mA means 1600/80 = 20 hours. Of course, if you want to run it off a rechargeable battery, it’s a whole different ball game. On the other hand, a light bulb isn’t on all the time and your IoT device might be. That does not seem like a whole lot, if you compare it to a 60 Watt light bulb which consumes about 250 mA (when running at 240V) which is about 3 times as much. What does that mean? Well, during normal operations your ESP will take about 70-80 mA (see this article on someone who did a lot of measurements). The ESP8266 has the ability to go to deep sleep. ![]()
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