Blueprint

Air quality sensor

detects air quality in air and does stuff

Created by poofer poofer

Tier 4

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poofer poofer added to the journal ago

big problem

image

I dont know why there is alot of flags on there even though most of the stuff are connected properly. for now im going to double check everything. surely its like a careless mistake right?

poofer poofer added to the journal ago

breakthrough

i just realised i can use the VBUS output for the 5V needed
also i routed the rest of the circuit.
i dont need to change my mcu anymore ^-^
image

here is my final finished schematic
now i just got to pcb it now.... sigh

poofer poofer added to the journal ago

route schematic, realised a major error

image

ok so i added wires to the schematic, spent a LONGGGGG time learning how to make lables ( i was labling manually last time) and now i did

after that i realised tha major error...
TWO of my components need FIVE WHOLE VOLTS OF DC power so uh... i need to change my microcontroller.... uh oh

poofer poofer added to the journal ago

downloaded the symbols and footprints

ok so for a beginner ( i forgot everything ), this is REALLLY hard..
i had to reinstall and move some files around and i almost deleted some root files but its fineee because i got everything done! right?

either way i downloaded all the parts i needed and now i just need to make the schmatic (then i can move on to the PCB)

P.S
i also had to change the VOC sensor to SGP40 and
added an 128x64OLED screen ( SSD1306 128 x 64 )
image

image

poofer poofer added to the journal ago

Thought of the idea, researched on parts

ok so my room is REALLY dusty and i just got myself an airpurifier because i was turning on the air conditioner previously to get the dusty and stuffy feeling OUT

then i thought.. how can we make it abit more smart
sooooo... sensors!

i think these are the parts i should need
PMS5003 PM2.5
MH-Z19 CO2
MP503 VOC
DHT22 humidity + temp
ESP32-C3 brains
LED to signal
Buzzer to make sound
display to show stats

also here was my first draft for the schematic
Image 3326

poofer poofer started Air quality sensor ago

2/10/2026 2 PM - Thought of the idea, researched on parts

ok so my room is REALLY dusty and i just got myself an airpurifier because i was turning on the air conditioner previously to get the dusty and stuffy feeling OUT

then i thought.. how can we make it abit more smart
sooooo... sensors!

i think these are the parts i should need
PMS5003 PM2.5
MH-Z19 CO2
MP503 VOC
DHT22 humidity + temp
ESP32-C3 brains
LED to signal
Buzzer to make sound
display to show stats

also here was my first draft for the schematic
Image 3326

2/10/2026 11 PM - downloaded the symbols and footprints

ok so for a beginner ( i forgot everything ), this is REALLLY hard..
i had to reinstall and move some files around and i almost deleted some root files but its fineee because i got everything done! right?

either way i downloaded all the parts i needed and now i just need to make the schmatic (then i can move on to the PCB)

P.S
i also had to change the VOC sensor to SGP40 and
added an 128x64OLED screen ( SSD1306 128 x 64 )
image

image

2/11/2026 - route schematic, realised a major error

image

ok so i added wires to the schematic, spent a LONGGGGG time learning how to make lables ( i was labling manually last time) and now i did

after that i realised tha major error...
TWO of my components need FIVE WHOLE VOLTS OF DC power so uh... i need to change my microcontroller.... uh oh

2/12/2026 - breakthrough

i just realised i can use the VBUS output for the 5V needed
also i routed the rest of the circuit.
i dont need to change my mcu anymore ^-^
image

here is my final finished schematic
now i just got to pcb it now.... sigh

2/15/2026 - big problem

image

I dont know why there is alot of flags on there even though most of the stuff are connected properly. for now im going to double check everything. surely its like a careless mistake right?