TempMate
a simple small form-factor device that can record & display temperature on a .91 inch oled display, with the main mcu being attiny416 and for temperature sensing we'll use mlx90614
Created by
TheMudGuy
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TheMudGuy
added to the journal ago
routed the PCB
completed the routinng and dude, i also encourntered like 40+ errors, now gotta fix em TT:
btw i think that it is looking cool, just gotta add some silkscreens,branding etc
TheMudGuy
added to the journal ago
Designed the schematic
This is the device's schematic, its a simple schematic which connects the sda scl of both the display & sensor with the mcu & also power all the components , it has 2 pull up resistors on i2c line of the sensor for experiment, i will first try with internal pull ups and if it didnt worked i will solder the resistors after that
and also there is a button which when pressed wakes the device frm sleep and measures and then go to sleep again ,
as of now the oled is 
kinda big for this project , so will have to search a alternative
TheMudGuy
added to the journal ago
Researched about the idea, and finalised BOM
so i thought to make a small device powered from a coil cell(i.e cr2450) which can measure temperature from -70 degree Celcius to +380 degree celcius using the sensor MLX90614:
the BOM:
1x ATTINY416
1x MLX90614
1x HS91L02W2C01 oled display
1x button
1X CR2450 AND ITS HOLDER
TheMudGuy
started TempMate ago
3/1/2026 1 PM - Researched about the idea, and finalised BOM
so i thought to make a small device powered from a coil cell(i.e cr2450) which can measure temperature from -70 degree Celcius to +380 degree celcius using the sensor MLX90614:
the BOM:
1x ATTINY416
1x MLX90614
1x HS91L02W2C01 oled display
1x button
1X CR2450 AND ITS HOLDER
3/1/2026 2 PM - Designed the schematic
This is the device's schematic, its a simple schematic which connects the sda scl of both the display & sensor with the mcu & also power all the components , it has 2 pull up resistors on i2c line of the sensor for experiment, i will first try with internal pull ups and if it didnt worked i will solder the resistors after that
and also there is a button which when pressed wakes the device frm sleep and measures and then go to sleep again ,
as of now the oled is
kinda big for this project , so will have to search a alternative
3/2/2026 - routed the PCB
completed the routinng and dude, i also encourntered like 40+ errors, now gotta fix em TT:
btw i think that it is looking cool, just gotta add some silkscreens,branding etc