BeagleBone Black temperature sensor #BeagleBoneBlack @TXInstruments @beagleboardorg

NewImage

BeagleBone Black temperature sensor. via Paul Pinault

Here is a quick hack to interface a temperature sensor to a BeagleBone Black unit.

I choose to use a Microship TCN75AVOA component. This SMS component is not really easy to use for prototyping but feasible. This components have a unit cost < 1€ and operate at 5V or 3.3V (as for BeagleBone). A Dip8 version exists. The communication with the CPU is numerical based on a two wire connection type I2C. It measures from -40°C to +125°C on 8b + 4b decimal with +/- 1°C precision. GPIO1_28 (gpio60) is used for SDA (Data), GPIO1_16 (gpio48) is used for SCL (Clock). A0, A1, A2 are used to indicate the sub address of the chip. I used 10K Pull-up resistor and 3.3V VDD. For implementation, we may have different way to interface an I2C component with Linux, really beautiful, integrated and so on. But … I prefer the basic way and will give you some peace of bash code to do it. The principle is to generate the bus signals by manually changing the values on the SDA & SCL wires. SCL use is simple, it is an output GPIO used for clock signal. SDA use is different : it can be an input or an output and for each octet transmitted from the BBB, the sensors will send a ACK/NACK bit to be read. Basically, each frame starts with a start message, then have the 7b I2C device address + 1 bit operation (read or write), confirmed by an ACK from this device. It can be followed by a 8b register address or a 16b read or write.

NewImage

Read more


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 code.org, 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 35,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

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 https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — How (some) chips get made

Wearables — Sample code is your new best friend

Electronics — Solder braid quick fix

Python for Microcontrollers — Python on Microcontrollers Newsletter: Mu 1.2.0 Released, WSL Out of Beta and so much more! #CircuitPython @micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Jellyfish Lanterns, Matter 1.0, and more!

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! — JP’s Product Pick of the Week 11/22/22 EyeSPI Breakout @adafruit @johnedgarpark #adafruit #newproductpick

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



No Comments

No comments yet.

Sorry, the comment form is closed at this time.