Disconnect circuit for 12 volt lead acid and lithium batteries

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KA7OEI designed a circuit that disconnects the battery when it over-discharges. He writes:

The avoidance of overcharging is usually pretty easy to avoid: Just use the appropriate charging system – but overdischarge is a bit more difficult, particularly if the battery packs in question don’t have a “protection board” with them.

Lead acid batteries (almost) never come with any sort of over-discharge protection – one must usually rely on the ability of the device being powered to turn itself off at too-low a voltage and hope that that threshold is sensible for the longevity of a 12 volt battery system.

Disconnect circuit for 12 volt lead acid and lithium batteries – [Link]

Thermometer 0-99C Using PIC16F1825

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This digital temperature meter provides real-time temperature values from 00 to 99 degrees Celsius. The Temperature Monitor project built using PIC16F1825 Microcontroller from Microchip, CAT4016 serial to display driver IC from ON-Semiconductor, DS18200 Temperature sensor and two 7 Segment common anode 0.5 Inch display. This little handy project consumes low current and can be work with 4.5 V batteries, intensity of the display can be change by replacing value of R1, read Cat4016 data sheet for more information about current setting. Display range 00 to 99 degree Centigrade.

Features

  • Supply 4.5 to 5V DC
  • Range 00 to 99 Degree Celsius
  • On Board Power LED

Thermometer 0-99C Using PIC16F1825 – [Link]

dot – The Physical Push Notification

Dot uses precise location tracking to make your smartphone’s notifications highly intelligent and contextual.

dot uses your location to make your smartphone more aware of your surroundings.

Launching Soon. Sign up for updates and get 10% off our Kickstarter!

Dot want to teach your smartphone how to recognize your daily patterns and behaviors in the places that make up your life (bedroom, car, kitchen, garage, desk at work, etc).

dot – The Physical Push Notification [Link]

 

Environmental Monitoring with TPS, Azure, and PowerBI

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Сollect environmental data with Tibbo Project System devices, process it with Azure Stream Analytics and visualize using Power BI.

Environmental Monitoring with TPS, Azure, and PowerBI – [Link]

Using Bluetooth LE in Products

Jone Teel over Makezine walked through how to use BLE (Bluetooth Low Energy ), aka Bluetooth smart, in an electronic product.

BLE, unlike classic Bluetooth, it’s not designed for big data transmission or streaming audio or video. BLE comes in SoC (System on Chip) ICs which combine a RF transceiver and a microcontroller running the Bluetooth stack (firmware) all in a single chip but you can still have the transceiver alone and run the software stack firmware on your processor.

Possible Hardware Configuration in BLE Solutions - Getting Started with Bluetooth Low Energy by Kevin Townsend, Carles Cufí, Akiba, and Robert Davidson (O’Reilly)
Possible Hardware Configuration in BLE Solutions – Getting Started with Bluetooth Low Energy by Kevin Townsend, Carles Cufí, Akiba, and Robert Davidson (O’Reilly)

According to Jone, the software stack of Bluetooth Classic must be purchased separately and costs at least $10,000 USD plus a per unit licensing fee for every unit sold. Now, BLE SoC makers provide the software stack free in most cases. For example, Nordic Semiconductors provides the software stack S110, S120 and S130 SoftDevice for free.

most popular BLE chip solutions - Makezine
most popular BLE chip solutions – Makezine

 

Jone advises to use ready made BLE modules rather than chips and this will reduce the costs required for FCC certification and eliminate the need for antenna tuning.

Jone ends his article talking about the Antenna design solutions using a ceramic antenna or a trace antenna on PCB.

Via: Makezine

How to Upgrade Your ESP8266 SPI Flash to 4MB

ESP8266, the well known WiFi module contains an ESP8266EX SoC IC and an external SPI flash. This external SPI flash is used together with ESP8266EX to store user programs.

The supported size of flash by ESP8266EX is up to 16MB but some of ESP8266 modules contain flash chips with low storage capacity like 512KB. In some cases you need more space. For example, if the upgrade Over The Air “OTA is enabled: the minimum flash memory that can be supported is 1 Mbyte” according to ESP8266EX datasheet.

The SPI flash used in ESP8266 modules is W25qxx from Winbond, and in order to upgrade your flash memory you need to remove the old chip soldered to your module PCB and then solder the new one W25Q32 (32M-bit / 4M-byte), which can be ordered from Aliexpress.

w25qxxesp8266upgrade

[Code and Solder] channel over Youtube shared with us how to do the upgrade process.

Via: embedsysweekly

Simple Arduino Radio with TEA5767

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@ instructables.com has uploaded a new tutorial on how to make a simple arduino radio based on 2.2″ TFT ILI9225 controller, TEA5767 breakout board and Arduino MEGA2560. The radio can play a list of predefined stations and can’t scan through them.

So, I was searching for a tutorial to create a simple Radio with Arduino… And all what I found was very complex sketches for a very simple result, and I didn’t find any tutorials to use it with a TFT and UTFT library.

I decide to create a tutorial for noobs like me which are searching for it

Simple Arduino Radio with TEA5767 – [Link]

Dual output step-down charge pump operates without inductors

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Linear Technology’s LTC3256 is a high voltage low noise dual output power supply, which takes a single positive input and generates 5V and 3.3V step-down supplies with high efficiency and no inductors. by Julien Happich @ edn-europe.com

The device features a wide 5.5V to 38V input voltage range and includes independently enabled dual outputs: a 5V 100mA supply, and a 250mA 3.3V low-dropout (LDO) regulator, for a total of 350mA available output current.

Dual output step-down charge pump operates without inductors – [Link]

Eagle 7.6.2 – First Beta Release After Autodesk’s Acquisition of Cadsoft

It has been one month since the Autodesk’s acquisition of Cadsoft.

After the acquisition, they redesigned the website and changed the domain name from cadsoftusa.com to cadsoft.io. It seems that Autodesk is going very fast toward sharing with community what they intend to do with Eagle CAD tool after a lot of debates about the future of Eagle CAD.

Now and after about one month of the acquisition, they announced the release of EAGLE beta (7.6.2). “A number of items are “in development” but we’re looking for feedback, so it was better to push these early!” stated by the announcement.

The new features in this beta release include net names on tracks in the PCB editor.

net names on tracks in the PCB editor- Images courtesy of eagle.io
net names on tracks in the PCB editor- Images courtesy of eagle.io

The 7.6.2 beta version introduced a new button. It’s called MAKE button.

MAKE button produces the necessary outputs for fabrication, assembly, test, etc and upload your design files (including schematic, PCB, BOM, etc) to your user profile on Autodesk’s Circuits.io site.

MAKEButton

Another new button is called MCAD. This button will upload your design to ECAD.io which is an online Electrical CAD (ECAD) to Mechanical CAD (MCAD) file converter.

Visit eagle.io to see the announcement and to download the new beta version.

The video below demonstrates how MAKE button works.