Oxygen Sensor Display & Alarm System
Budget: $30 – $250 USD
I’m building a compact monitor that reads oxygen levels, shows them on a small graphic LCD, and triggers alarms when thresholds are crossed. Here’s the functionality I’m after:
• Sensor interface: Accept input from a standard electro-chemical or digital oxygen sensor (I can source the sensor, you handle the wiring and calibration in code). Video link shows the sensor and the code he used.
• Graphic LCD output: Continuously display the real-time O₂ percentage on a monochrome or simple-color graphic LCD, large enough to read at a glance. No touchscreen features are needed.
• Alarms:
– Audio: buzzer or small speaker that sounds when levels go below or above set limits.
– Visual: a single red LED that blinks in sync with the audio alarm.
• User-set thresholds: Set to >23.4% O2.
• Microcontroller firmware: clean, well-commented code (Arduino, STM32, or similar—open to your suggestion) that ties it all together.
• Deliverables: circuit schematic, parts list/BOM, compiled firmware plus source code, and a quick start guide so I can reproduce the setup on my bench. I have not uploaded code, so I may ask for a step by step or for you to program/upload for me.
A breadboarded or strip-board prototype is fine; no custom PCB required at this stage. Please only bid if you’ve previously worked with gas sensors or similar real-time monitoring projects and can deliver a reliable proof-of-concept within a couple of weeks.
Video odf sensor used and the programming he already created - https://www.youtube.com/watch?v=I4yJo7QOKpk
Link to sensor: Ultrasonic oxygen sensor OCS-3F https://www.winpower.com.cn/en/products_show.asp?cid=613&aid=2447
• Sensor interface: Accept input from a standard electro-chemical or digital oxygen sensor (I can source the sensor, you handle the wiring and calibration in code). Video link shows the sensor and the code he used.
• Graphic LCD output: Continuously display the real-time O₂ percentage on a monochrome or simple-color graphic LCD, large enough to read at a glance. No touchscreen features are needed.
• Alarms:
– Audio: buzzer or small speaker that sounds when levels go below or above set limits.
– Visual: a single red LED that blinks in sync with the audio alarm.
• User-set thresholds: Set to >23.4% O2.
• Microcontroller firmware: clean, well-commented code (Arduino, STM32, or similar—open to your suggestion) that ties it all together.
• Deliverables: circuit schematic, parts list/BOM, compiled firmware plus source code, and a quick start guide so I can reproduce the setup on my bench. I have not uploaded code, so I may ask for a step by step or for you to program/upload for me.
A breadboarded or strip-board prototype is fine; no custom PCB required at this stage. Please only bid if you’ve previously worked with gas sensors or similar real-time monitoring projects and can deliver a reliable proof-of-concept within a couple of weeks.
Video odf sensor used and the programming he already created - https://www.youtube.com/watch?v=I4yJo7QOKpk
Link to sensor: Ultrasonic oxygen sensor OCS-3F https://www.winpower.com.cn/en/products_show.asp?cid=613&aid=2447