Callipygous Posted December 20, 2020 Share Posted December 20, 2020 I made a project involving voice recognition on a raspberry pi so you can speak a password to open a box. Long story short, my DC-DC step up converter to power the latch seems to be super unreliable. I am wondering if some of my trouble is related to how I have it wired up and if someone could suggest a better approach. I have 2 battery packs (https://www.adafruit.com/product/354) wired in parallel. Those are powered off a charger (https://www.adafruit.com/product/390) So output of this board, and the two batteries, are connected to the main positive and negative lines at the edge of my PCB. Attached to those lines I have a boost converter (https://www.adafruit.com/product/2030) which powers my raspberry pi. Also attached to the main lines, I have an adjustable boost converter (https://www.amazon.com/gp/product/B01MS3IAVL/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1) the positive on the positive line, the negative comes back to the collector of a TIP 120 (https://cdn-shop.adafruit.com/datasheets/TIP120.pdf) the emitter goes to the negative line on the PCB. The base is connected via a resistor to GPIO on my raspberry pi. I had it all sorted out and working about 2 weeks ago, and then it just stopped. I have had problems numerous times when I came back to the project and the output voltage of my converter had drifted from the desired 12V. So when it stopped working I opened the box up and checked on it, it was putting out 5 volts and wouldn't respond to adjustments on the potentiometer. I have been troubleshooting all weekend, but just now I tried wiring it directly to the battery lines and it works as expected. Is something about my setup throwing it off? Do I just have a cheap, unreliable boost converter? Interestingly, on my original order it says the input range is 3-32v, but now the link I provided says 5-32v. Could my problem be related to low input voltage? Link to comment Share on other sites More sharing options...
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!Register a new account
Already have an account? Sign in here.Sign In Now