In Progress

Battery powered air quality sensor

Looking for someone to guide me on how turn off and on sensor using (MQ-135 or similar) using NodeMCU running on 18650 battery. Main requirements are:

1. Power consumption low (uA) during sleep so battery can last 1 year.

2. Able to detect when battery is low and send an alert

3. Receive updates via OTA

There will be 4 milestones:

1. Circuit design (Frizting or similar) to prove your knowledge and understanding of the problem

2. Video of power consumption in wake and sleep

3. Code review

4. Successful assembly at my end

Skills: Arduino, Electrical Engineering, Electronics, PCB Layout, Wireless

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About the Employer:
( 1 review ) Singapore, Singapore

Project ID: #16505557

Awarded to:


I have Bachelors in Electrical Engineering and holds Masters degree in Energy Systems Engineering with strong research background. I would be pleased to do this job for you. Look forward to hearing from you soon. More

$100 USD in 3 days
(25 Reviews)

6 freelancers are bidding on average $239 for this job

$155 USD in 3 days
(16 Reviews)

Hi There I have checked your project description and understand everything. I am very confident that i can do this project perfectly. Thanks

$250 USD in 3 days
(38 Reviews)

Good Day! We are a group of computer engineers who are expereinced in bot hardware and software development. We have been doing arduino projects for 5 years now thus having the right amount of knowledge and experience More

$66 USD in 3 days
(8 Reviews)

I can do your job.

$833 USD in 30 days
(2 Reviews)

I am an engineer and confident of what I can do and deliver. I can work on Arduino, Python, Matlab, among others. I am asking for a chance to work with you on your project.

$30 USD in 2 days
(1 Review)