3/16/2023 0 Comments Deepsleep esp8266Here is some code, and ways to handle variable storage. When your program has done all that it needs to, before the closing bracket, you just throw in: //1,000,000 = 1 secondĪnd of course this assumes we have the following include at the beginning of the sketch: #include Īt the end of the time specified in the deepSleep() function, the ESP will reset, and start everything at the beginning again. Your setup() function in effect becomes your loop. So, any variables, loop counts, etc, they all get lost. The deepSleep() function will essentially reset your ESP. When programming with the Arduino IDE, a lot of your heavy lifting code will be in the loop() function. In my example, I went from using an almost constant 40 mA, and cut it down to 3 mA.Ĭode-wise, you do have to think a little differently. The point is, if your circuit is spending most of its time doing nothing, you can really cut back its power use by leveraging the deepSleep() function. Those 3 mA are lost power consumed by the ghosts of necessary evil. In actuality, the ESP and the other components of the circuit are only drawing micro amps, but the project makes use of a voltage converter and regulator because it's fed off of 12 volt batteries. In the video, you can see that while in deep sleep, the unit is only drawing about 3mA. The video at the beginning of this Instructable shows the actual power consumption of a data logging module I developed. But if you are going to power your project by batteries, every mA counts. Once attached be careful not to tug on the wire as you may rip pin 16 off the PCBīut fortune favours the brave.When your IoT project is powered by a plug in the wall, you tend not to care too much about power consumption.Don’t get excess solder on the pin next to pin 8.Thankfully I’ve modded ten modules and not broken any yet. I was initially worried but decided that the modules are so cheap I could take the risk. If you are sceptical about how successful you might be I would recommend practising on a scrap PCB. But if you are doing that you don’t need to worry about this hardware mod. The module will remain in deep sleep until it sees a rising edge (Low to High) on the reset pin. If you call deepSleep with a zero like this : ESP.deepSleep(0) The maximum value you can pass to the deepSleep function is 4294967295. If you want to specify the sleep time in seconds you can use a variable and do this : ESP.deepSleep(sleepSecs * 1000000) In this example the module will sleep for 60 seconds (60 million microseconds). Once your hardware is ready you can use deep sleep by adding a single line of code at the end of your Arduino IDE Sketch : ESP.deepSleep(60 * 1000000) This video is a photo slide show but gives a few useful tips : This video shows the soldering process although I didn’t use any flux : Everyone has their own style and technique but I found watching a few of these useful before trying it myself. There are a number of videos on YouTube that show other people performing this mod. Being normal insulated wire it’s easier to avoid touching other pins :Ī jumper (shunt) completes the circuit and can be removed if necessary. The other end of this wire is soldered to the reset pin. The thin copper wire is soldered to one pin :Īn additional piece of wire is soldered to the other pin : In order to allow me to disconnect this mod I routed the connection via a 2-pin header which I super-glued to the rear of the module. The connection will be fragile so you may want to secure the wire with a blob of hot glue.Īt this point some people then solder the wire to the reset Pin, being careful not to touch any other metal parts. You don’t need to attempt to solder directly to the pin. This is enough to melt the solder which then sticks it to the pin. Then a few millimetres away from the pin I touched the wire with the soldering iron. I touched the end to the pin on the 8266. I used a strand of thin copper wire and applied a thin layer of solder to one end. Holding the module in a magnifying glass “helping hand” allows you to see the pin. The modification looks a bit scary but becomes easier with practice. The diagram below shows the location of pin 8 on the module : When the onboard clock decides it is time to wake-up it pulls the XPD_DCDC pin Low briefly which causes the ESP8266 to reset. The modification connects pin 8 (XPD_DCDC) on the ESP8266 chip to the module’s reset pin. This article will explain how to enable deep sleep. However to wake up after a set amount of time it requires a hardware modification. It can be put into a deep sleep state where its power consumption is measured in micro-amps. The ESP-01 is a small, cheap ESP8266 based module with WiFi support.
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