[Jobs] Looking for technical help for small personal project

[Jeff Conley]

If you swap the 2n2222 with a MOSFET it should work. The 2n2222 has a
collector - emitter voltage drop of around 0.7-1 volts when saturated.

On Wed., Aug. 5, 2020, 8:04 p.m. Ivan Salazar, <iesalazars at gmail.com> wrote:

> Hello!
>
> I'm looking for someone to help me finish and then possibly improve a
> personal project, along with explanations so I can learn along the way. I'm
> a software developer and have no real electronics background apart from
> just playing with electronics since I was young. More details below.
>
> It's a device that will be placed in a remote location, powered by a solar
> panel, flooded 12v battery charge controller and communicating with
> cellular data. The brain of this project is a Particle Electron (
> https://docs.particle.io/tutorials/device-os/led/electron/)
>
> My project's main features are:
> - Take pictures with a camera (using TTL) and upload to the cloud
> - Measure temperatures from outside (DS18B20) of the project box and
> inside (LM35)
> - Being able to monitor the 12v battery's voltage
>
> My first thing to solve is that I'm having some problems with the camera
> communication not working properly, I'm using a voltage regulator (L7805CV)
> and a NPN Transistor (2N2222) in order to turn the camera on and off when
> needed to save battery, the TTL communication is failing (if I don't use
> the 2N2222 and use only the regulator, which wouldn't allow me to turn the
> camera on and off, then it works). I would like to know how to fix the
> problem.
>
> Secondary to the above, I would be interested in knowing overall thoughts
> and suggestions to improve the current design, as long as it's not an
> entire rework, of course.
>
> I'm happy to share the design files I have so far, Schematics and PCB.
>
> This is a personal hobby project so I really don't have a big budget for
> this. How much would your help cost? Would it be an hourly or flat fee?
>
> Thanks for your time!
> Ivan Salazar
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