Silent Temperature switch

There is an off the shelve temperature switched called the w1209 which has essentially the functions I need. However, I need it to be silent without the click of the relays. I think a npn transistor would work just as well but without the noise. Further I need it to be hard set at 36C, no buttons, no display. Additionally, the w1209 runs on 12V. I need it to run on 7.2V. If possible it should have a charging circuit for lipo 2s pack as well. Power source should be a micro USB charger. No idea if all this is possible.

Skills: Electrical Engineering, Electronics, PCB Layout

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About the Employer:
( 1 review ) Leipzig, Germany

Project ID: #17390935

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Of course, it is possible. w1209 uses a cheap STC microcontroller to switch the relay. we can modify/re-design the same with semiconductor switch and charging option. Relevant Skills and Experience I have designed tem More

$250 USD in 10 days
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15 freelancers are bidding on average $359 for this job


I am embedded system electronics engineer and have expertise in various sensors and PCB designing. I have worked on temperature data logger, home automation, smart hydroponics system, etc. Relevant Skills and Experien More

$400 USD in 16 days
(18 Reviews)

Hi, I hope you are doing well. I have used w1209 and I understand how it works, I have redesign it with noise less components. Relevant Skills and Experience I have expertise in embedded system design and development More

$750 USD in 15 days
(31 Reviews)

i am electrical engineering expert Relevant Skills and Experience pcb layout Proposed Milestones $555 USD - 1

$555 USD in 10 days
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Greeting there , I could absolutely help you with your switch system project i am very excited work on your project and help you get it done in short time Relevant Skills and Experience i Ranked as Top rated free la More

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How r u?Buddy,,I have an idea for that in my mind.... Relevant Skills and Experience Control and Automation Sound proofing damp proofing Image processing Arduino PIC/ atmega Proposed Milestones $250 USD - enough budd More

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the schematic,pcb design,BOM Relevant Skills and Experience HELLO i am a computer engineer,i have masters in computer engineering,i have more than 7 years of experience in electronics and arduino,i can implement to u More

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Sir, I have read your requirements and would like to inform you that i have already deal with some similar task aslo i have some sample projects to show please ping me to discuss further

$250 USD in 3 days
(3 Reviews)

Hi hello guten morgen my [login to view URL] i understood everything is very simple and you have a little mistake you don't use a npn transistor for this kind of job. I can help you and give fast results for a good [login to view URL] you More

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arduino with tmp36 sensor besed circuit. as output npn is not good, is better put some 5v solid state relay. for power supply arduino accept 7,4 volt and you can charge battery from every module already done from int More

$250 USD in 10 days
(0 Reviews)