Sealed lead acid battery testers #Batteries @Brian_Dorey

Brian Dorey posts about using 12 volt sealed lead acid (SLA) batteries and the need to test them:

We use 12 Volt sealed lead acid batteries (SLA) for many different uses from shed lighting to running radios and other 12V equipment which needs a portable power supply.

To check the charge status of the batteries we usually use a multimeter but with some being used as shed lighting on our allotment it would be useful to have a built in voltage tester fitted on the batteries so we don’t need to carry a multimeter with us each time.

We mainly use the 12 Volt 7 Amp and 12 Volt 12.6 Amp batteries and so Andrew designed a custom PCB which fits direct onto the top of the batteries and has a voltage tester circuit with LED indicators for the charge state.

The circuit uses a Microchip PIC16F1933 with a 5V 78L05 voltage regulator to power the microcontroller and a voltage divider is used to drop the voltage down to a level that can be measured by the internal ADC. A row of 10 LEDs are used to display a voltage range of 11.6V to 12.7V. The LEDs are coloured red, yellow and green to make it quick and simple to see the charge state of the battery. Green means the battery is still charged, yellow means it is getting low and red means it needs recharging.

The PCB design files in Diptrace format and microprocessor code can be downloaded from GitHubDownload the schematic in PDF format.

See the full post here.

Plastic cover fitted on the battery

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 35,000+ 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 — Challenges in trade between China and U.S. highlighted by forced labor bill

Wearables — This one’s for all the Cosplayers out there

Electronics — Avoid serial confusion!

Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython 8 Beta 1, Hacktoberfest and much more! #CircuitPython @micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — CO2 Canary In a Coalmine, AQI Funnies, 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! — NEW PRODUCT – Adafruit ENS160 MOX Gas Sensor – Sciosense CCS811 Upgrade – 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.