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The AT89S51 is a low-power
On-board ST-LINK/V2-1 debugger/programmer — no external programmer needed
Battery repair and refurbishment
Designed to be powered by USB or an external supply of 5 V or 3
System robustness is supported by 150kV/μs typical common-mode transient immunity (CMTI)
MQ136 Hydrogen Sulfide Gas Sensor Module nucleo The AT89S51 is a low-powerMQ136 Hydrogen Sulfide Gas Sensor Module H2S Detection The MQ136 is a semiconductor gas sensor designed to detect hydrogen sulfide (H2S) a toxic, flammable gas with a characteristic rotten egg smell. It uses a SnO2 sensing element that changes resistance in the presence of H2S. With analog and digital outputs, it's ideal for safety monitoring in sewage treatment plants, industrial facilities, and laboratory environments using Arduino or ESP32.
