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Case study
ATmega8 Heat Stress Monitor
Standalone wearable/fixed heat-stress monitor built on bare-metal ATmega8, no Arduino framework.
ATmega8CEmbedded FirmwareSensors
Alert levels
3 (SAFE/WARNING/DANGER)
Sample interval
30s active / sleep between
Unit cost
<$8 in parts
Problem
Outdoor industrial workers in Gulf-region summer heat need a cheap, reliable early-warning device for heat stress — commercial options were too expensive for mass deployment across a workforce.
Stack
- ATmega8 (bare-metal C, avr-gcc)
- LM35 + HIH-5030 + MQ-135 sensors
- LM358 op-amp signal conditioning
- 16×2 LCD + tri-color LED alert
- UART logging (9600bps)
Architecture
Outcome
Calibrated analog front-end and on-chip threshold logic drive a three-level SAFE/WARNING/DANGER alert on the LCD and tri-color LED, with every reading logged over UART for record-keeping.