Honeywell HPMA115S0

1

1

this is a non-functional unit showing 900 ug/m3 readings. The design looks neat, compact and many test points

2

2

after removing the plastic cover, here the core of the sensor. The diode was removed. The terminals for the diode is far left on the board

3

3

under the metal, the cover is the circuit board which features an STM32F030F4 microprocessor.

4

4

close up on the main chip. The circuit looks very nice.

5

5

the circuit board with a laser diode with Level 4 printed