capacitive sense touch keying circuit for Morse code transmitters

Færdiggjort Opslået 5 år siden Betalt ved levering
Færdiggjort Betalt ved levering

I am the owner of RadioSet-GO, a source of innovative, portable, QRP (low power) HAM radio equipment. I used to purchase capacitive touch key boards to integrate with my projects and they worked perfectly. Unfortunately, the owner of that business passed away, and I am left trying to come up with something just as good. I have attempted several circuits myself with only some success. I have a lot of insight into the subject that will help.

Here is what I need: A capacitive sense touch keying circuit for Morse code transmitters.

It needs to be small (I will make it surface-mount), operate on 12VDC, be energy efficient, and self calibrating. It will have only two inputs , one for dits and another for dahs. The input contacts are metal endcaps which mount to the outside of Pelican boxes. Touching the contacts with finger tips will switch the iambic keyer inside the radio and cause it to transmit. Touching both at once and holding will result in both switches closing and an alternating di-dah-di-dah-di-dah sequence by the internal keyer. Switching resistance must not exceed a certain value, and needs to be stable. It needs to respond to touch as instantly as possible, without false readings or 'self-keying'. It also needs to be immune to RFI and not generate noise in the receiver. The circuit will be used in a variety of RF environments with different antennas, up to 15 watts PEP.

Those are the general requirements.

The circuit that worked so well for me implemented two 12F683 IC's. I have included a circuit diagram, so if you can create a .hex file to make this exact circuit work for me, that would be ideal.

If you feel you are suited for this project, I will provide more helpful insight.

Thank you!

Kredsløbs Design Elektrisk Ingeniørarbejde Elektronik Ingeniørarbejde Microcontroller

Projekt ID: #18526786

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12 bud Remote projekt Aktiv 5 år siden

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ander454

Hi, as you can see from my profile I am a capacitive sensing expert with more than 10 years experience doing what you require. I would actually advise using this IC: [login to view URL] Flere

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12 freelancere byder i gennemsnit $595 timen for dette job

Euroaccount

Hello How are you? I read your project description carefully and I really want to work on this project. I am an electrical engineer who has 7+ years of experience in circuit and PCB design and embedded programming. I h Flere

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Anthony989

Hello, I am Anthony from Sri lanka. We are a hardware designing & prototyping company. Why you should hire me ? - I have seven years of experience in the field and have developed many systems. - I ha Flere

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elecirdeign

Hi, I am Electronics Experts in Ireland, with 15+ years experience in industry. I have worked with several US companies to develop their new products. I am familiar with Microchip MCUs and have done several projects Flere

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Tomorrow1201

Hi there.I offer you the services for PIC12F683 designs, I complete the PIC jobs in MPLAB. I am new on freelancer site, but I am designer expert with 10+ years of experience in Circuit designs, PCB designs, microcontr Flere

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NMoshEng

Hi, I've worked with touch sensors before and can suggest a few options that would not require using an mcu, but a simpler circuit designed for touch key sensing. With a pcb made with the right layers design i think Flere

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arn1991

Hey, I am a proficient PCB designer with more than 6 years experience in this field. I've done layout in Altium for high speed and RF circuits. Furthermore, I designed an SDR with high power transmitter and I know what Flere

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viditk95

Hey, Your project looks really cool. These are kind (unique) of projects I am looking work on. Truthfully I don't have much experience with capacitive touch, but definitely can figure out how to get it done. I do h Flere

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tecnicarf

Dear sir: I'm specialist in high frequency circuit design. I've used several types of PIC microcontrollers to control RF equipment (frequency synthesizers, tone generators, PA controllers, etc). The capacitive touch Flere

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MundiaPizo

Am an electrical and electronic engineer, with experience in electrical and electronic designing please drop a text if interested.

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