In this video I’m gonna show the second revision of my esp32, battery powered PIR motion sensor. This second revision contains some optimizations to improve deep sleep power consumption as well as to fix some of the errors I had the first revision of the pcb.
Tag: 18650 battery
Voltlog #251 – InTheMail
Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We’re going to start with this pocket multimeter, it’s the MUSTOOL MT77, let’s get it out of the box. As you can see quite a small form factor, the multimeter is very thin and has this large screen to body ratio, let’s see if they included the batteries and yes the meter turns on, it runs on two CR2032 batteries but it seems they are included.
Voltlog #240 – ESP32 PIR Motion Sensor With Deep Sleep & MQTT
Welcome to a new Voltlog, in this video I’m gonna show you how I designed and built this board which functions as an esp32 based, battery powered PIR motion sensor. So I started by designing the circuit, I used some common building blocks, I added the ESP32 with it’s bypass caps, some test points and the programming circuit with auto-reset, I then added some connection points for the PIR sensor, an RGB LED because why not have a nice way to signal this is one of those very small digital RGB leds, it’s just 20x20mm, it’s connected to 3.3V even though it’s only rated for 5V so I’m hoping this is going to work even on 3.3, it’s also worth having a temperature/humidity sensor to also sense that in whichever room the node will be placed and finally the power supply circuit which is a simple low dropout regulator with an 18650 battery as the input.
I did not include a battery charger circuit on this module, because I wanted to keep things simple, I’ll have a battery socket so I can just remove the 18650 cell and charge it separately plus the whole circuit should run in sleep for extended periods of time giving me a long operating time so i wouldn’t have to charge the battery too often.
Once the schematic was finished I did the board layout in a hurry so it’s not exactly pretty or optimized
but I tried to move the esp32 antenna to the side, to place the PIR sensor in the top side as the module will probably sit vertically, I tried to place the temperature sensor in the bottom side to keep it away from any components that might get hot and also placed some isolation slots for the same reason.
You should check-out revB of this board, I made some improvements present in the video below.
Voltlog #184 – InTheMail
Hello everyone and welcome to a new InTheMail the series that will touch both your passion for electronics and your bank account at the same time.
In this episode you will see some 18650 batteries (INR18650-30Q), 26650 batteries(INR26650-50A), TS100 Soldering Iron, Blitzwolf Night Light BW-LT9, Iphone 8 Plus or X Dual Lens Mpow, Swiss D Clips, 50mm Ear Foam Pads Replacement and a 4 position switch. Links for all of these items can be found in the video description on youtube.