#Mqtt enter deepsleep code

Same goes for the SPX3819M5 on the Lolin NodeMCU.

The ME6211 is often used on the Wemos D1 mini board (which does not mean it is the best choice for low-drop/low Iq). It typically needs a 1uF elco on the input and a 2.2uF elco on the output to be stable. In all honesty I would advise AGAINST using any regulator giving less than 300mA.Īpparently it is possible to use two HT7333 chips in parallel. If the 90mV drop of the HT7333 is important for your project then consider adding a beefy capacitor. The MCP1700 as well as the HT7333 are often advised,but they are really at the verge of what an ESP8266 needs in current using WiFi. The problem here is that many of the LDO’s that have a very low quiescent current, also have an output current that is on the edge of what the ESP8266 needs at startup.

This will be used in a yet to appear chapter 7 in this series. Ditto for the XC6204, that has a standby current of 0.1 μA. Ditto for the ME6211 A &H types, these have a standby current of 0.1μA. In standby mode its current draw is practically zero. The SPX3819 also has an enable pin that needs to be pulled HIGH for it to work. You dont want a regulator that needs a big input voltage in order to maintain 3.3Volt, so you will need a Low drop regulator, a so called ‘LDO’Ħ0mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input‎ If you are using 2×1.5V AA cells (unlikely) or LiFePO4 battery (3.6V) you could get by without a regulator, but if for instance you are using 3×1.2V NiCd-s or a 3.7V Lipo (that can go up as high as 4.2Volt), you are going to need a regulator. If you have young eyes and a steady hand you can try to solder a wire on the GPIO16 pin. The ESP8266-01 would be perfect after you remove the LED, but it does not have the DO/GPIO16 pin broken out. The ESP M2 and ESP M3 can be used too as they have gpio16 broken out The ESP12 is the easiest though as the ESP-03 and ESP-04 for instance do not have the GPIO16 or RST pin broken out to a side connector, but to a pad on the PCB. This basically excludes most modules such as Wemos D1 mini or NodeMCU and only leaves the bare chips such as ESP-03, ESP-04 and ESP12 on a carrier board. No other power hungry other components such as FTDI chip or LEDs. You want your ESP board as lean as possible. I will just describe what I did to bring my ESP8266 to minimal energy consumption.

#Mqtt enter deepsleep code

I have gotten some inspiration from Erik Bakke’s OppoverBakke site, even though there was a mistake in his code snippets. There are also couple of other things to take into consideration. The ESP8266 can help with that, using DeepSleep.Įarlier I published a rather simple DeepSleep program, combined with MQTT, but from an energy conserving point of view there are more things in setting up DeepSleep that can make a difference. Intro: For the seasoned ESP user I might be over explaining things here, but apparently some people struggle with basic things around deepsleep, hence my perhaps somewhat overly long explanation.įor battery fed projects, low energy consumption is a must.