From the Forums: Build report of 3DP Testbench, Including Adafruit TFT & Printer


Build report of 3DP Testbench, Including Adafruit TFT & Printer, shared in the Adafruit Forums!

The test bench uses the stepper motor to turn a “throttle shaft” approx 90°, stopping every 0.75° to take an ADC measurement of the Throttle Position Sensor being tested. Usually, 120 or more values are measured and then put in an array and analyzed for standard deviation and also some strict bounding to make sure the plot doesn’t wave around too much. The bench decides if it’s good or bad. If it’s good, the response plot is printed out on the Thermal Printer with a summary of the analysis.

My company sells aftermarket parts for Ducati motorcycles and I started supplying TPSs. Two of the 4 models we sell I had custom made for us; they’re not currently available via retail channels. During my normal OCD understanding of how and why things work, I came to learn that the manufacturing industry considers a 4 point test to be the standard QC. And it doesn’t matter what continent the parts are coming from, that’s normal. After having a customer receive a TPS that had wonky output, I built a crude v1 test bench. Using a Mega and a crappy salvage store stepper, this bench was good enough to help us eliminate TPSs that slipped through the normal 4 point QC. I used my 3D printer to make the 54T gear and input to the TPS. This setup with the 1:3 gearing and crappy stepper was able to measure 33 to 35 points in each TPS. I basically checked that the change between steps’ measurements was within some range of bounds.

But to SEE the plot of the TPS, I had to use the serial monitor, copy the values as measured, paste them into a spreadsheet, then create a graph; in other words too much work! Then I discovered the 1.8″ TFT Shield with Joystick glowy thing. Upon the completion of this other crazy project, I knew it would be great to see the plot. Then when I saw the serial thermal printer I needed to make V2 of the TPS bench happen — I could print this part’s plot and include with it! No one gives 3 cares about quality, let alone like this. A little bit of effort on my part ensures no customer or shop will have to go through the painstaking process of replacing a TPS I sold them because it was built poorly! (well, never again after that first guy)

to be continued… gotta get to the pub. Still to come: explanation of the choices of equipment, pics of the guts, and some gotcha’s I learned along the way….

Read more.

Pasted Image 10 22 13 12 25 AM

Pasted Image 10 22 13 12 26 AM

As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email to let us know about your post so we can blog it up here.

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 32,000+ makers on Adafruit’s Discord channels and be part of the community!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more

CircuitPython – The easiest way to program microcontrollers –

Maker Business — Pololu’s account of the chip shortage

Wearables — Monster-inspired costuming!

Electronics — How to make your own magnetic field probe!

Python for Microcontrollers — Python on Microcontrollers Newsletter: New Releases of MicroPython and CircuitPython and more! #Python #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — 2021 in Recap!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 1/19/22 Feat. Adafruit 7-Segment LED Matrix Backpack – STEMMA QT / qwiic!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.