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• 26.12.2019 - Satellite case

  nj1337 • 12/26/2019 at 02:11 • 0 comments

  I've finished printing the satellite case. I'm not totaly satisfayed. i think i can do better and smaller and i'd like to add a reed switch for the alarm door. Actually, i'm using ESP01, and there is only 2 GPIO. I'm thinking about using an Wemos D1 or something like this, but i dont know the power consumption of that things and i need to study this before converting the project.

  The actual project use a MCP1700 3302e as voltage regulator for stable 3.3v. i'm using plastic insert for screw. they are cheap and easy to use. 

  Anyway here is the case of the satellite : 

  Closed.

  opened case.

  Thank you, see you next time , maybe with a new version of this.

• 11.12.2019 - Screenshot

  nj1337 • 12/11/2019 at 15:39 • 0 comments

  Here are some screenshot of the interface : 

  I'm designing the case =)

• 09.12.2019 - ESP01S + BMP280

  nj1337 • 12/09/2019 at 00:14 • 0 comments

  i'm building the first sattelite. 

  
  I've decided to use an ESP01S with wifi. The price is very low (2/3$) and it's pretty easy to program. 

  First i buyed this thing for programming the ESP01S: 

  I soldered a push button for programming the ESP01. the I used a firmware from ESPeasy : https://www.letscontrolit.com/wiki/index.php?title=ESPEasy

  
  You got a pretty cool web interface, and it reconnize some common sensor like BMP280 with i2c bus.

  you can set the software to update an MQTT broker (a raspberry pi 3 or 4).

  Now the deal is powering the beast. I'm using a unique 18650 battery. I think a 16340 can be used but i dont have any.  i printed a case for the battery and soldered an ON/OFF button. i used 28AWG cable, but 22AWG can be good too.

  Now the thing is to get 3.3V all the time. A 18650 battery will deliver 4.2V when full charged, wich is too much and 3.4V when discharged. After doing some research i found thant i cant use a standard regulator like an LM2596 cause the voltage dropout will to important. 

  I buyed an MCP1700 and 2 capacitor (1000uF electrolytic and 0.1uF ceramic). This type of component has a very low dropout voltage. its pretty easy to get this thingh to work. only 3 pins. 1 ground, 1 in, 1 out @3.3v.

  http://ww1.microchip.com/downloads/en/DeviceDoc/20001826D.pdf
  

  I soldered all the component on a bord : 

  now i got to make the case and try to make this thing as small as possible. 

  See you @ the next post for this =)

  Have a good day

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