IC monitors multicell battery packs

Intersil ISL94203

by Susan Nordyk @ edn.com:

The ISL94203 battery-pack monitor IC from Intersil monitors, protects, and cell-balances three- to eight-cell rechargeable battery packs, supporting Li-ion CoO2, Li-ion Mn2O4, and Li-ion FePO4 chemistries. Its internal state machine has five preprogrammed stages that accurately control each cell of a battery pack to extend operating life.

In addition to functioning as a stand-alone battery-management system for rechargeable Li-ion battery packs, the ISL94203 can be used with an external microcontroller communicating via an I2C interface. The device integrates high-side charge/discharge FET-drive circuitry, which allows the battery pack to be securely ground referenced.

IC monitors multicell battery packs – [Link]

Mesa-Video : 800×600 Digital video for Arduinos


blackmesalabs.wordpress.com has build a video system for Arduino boards:

This post describes Mesa-Video, a low cost, low power, small size and fully Open Source Hardware and Software solution for providing 800×600 digital video for Arduino ( and other ) microcontrollers. Mesa-Video makes it quick and easy to display text and 24bit color graphics from any MCU using a single UART serial port pin. Applications for Mesa-Video are embedded projects requiring video output and embedded developers wanting real time visibility into their system operation. Mesa-Video is the 1st of multiple Mesa-Modules planned.

Mesa-Video : 800×600 Digital video for Arduinos – [Link]

Arduino Oscilloscope


Noriaki Mitsunaga has build an Arduino Oscilloscope using minimum parts. He writes:

I have created a simple Arduino Oscilloscope as above picture shows. Here is its summary. You can build your own!

Arduino Oscilloscope – [Link]

MCP2221 HID Library


Zak’s Electronics Blog published a new library and breakout board for MCP2221 USB to UART interface IC:

This is a library for interfacing with the HID features of the MCP2221 USB to UART and I2C/SMBus serial converter from Microchip. The converter includes 4 GPIO pins, 3x 10-bit ADCs, 1x 5-bit DAC and more. Microchip does provide a library for interfacing with the chip, however it is supplied as proprietary DLLs. This project aims to be an open-source and multi-platform alternative. libraryThis library also makes use of HIDAPI.

MCP2221 HID Library – [Link]

ESP8266 + Attiny85 + DHT22 Temperature/Humidity Logger


by guibom @ github.com:

Basic ESP8266 + Attiny85 + DHT22 Temperature and Humidity logger. I’ve made this to experiment a bit with the ESP8266 wifi module, and hopefully make a remote sensor that posts the data to my server.

I wrote the code to work with both an atmega328 and a attiny85. The mcu sleeps in between readings, consuming about 35uA while powered down (the ESP module, even when chip-disabled, is responsable for about 80% of that).

The UDP messages are very specific to my use case; I have a node-red UDP listener that receives JSON strings from the logger and forward them as MQTT messages. But it should be very easy to change it to send whatever you might need.

ESP8266 + Attiny85 + DHT22 Temperature/Humidity Logger – [Link]

Enclosure 1455 NHD won’t be scared by a hot summer


The latest extruded aluminium enclosure from Hammond production – 1455 NHD is suitable even for devices requiring more intensive cooling.

The latest addition to the family of the popular 1455 enclosure series is the enclosure with “NHD” suffix – where “HD” marks “Heat Dissipating” design. Six fins (zones) with cooling ribs significantly improve cooling. With its “N” size it´s suitable for PCB of the “Eurocard” size (100x160mm).

Possibilities of the new enclosure
They´re really wide. Thanks to seven inner slots, it´s easy to find a suitable position for your PCB. Removable front panels consequently secure a PCB against movement and at the same time they can be easily machined by drilling/ milling for usage of various connectors, switches, LEDs,…

And it´s still not all …
As the body of the enclosure consists of two pieces – with a removable base plate, it provides excellent reach to inner electronics even in case, when we don´t want to remove the PCB from the enclosure. The enclosure also contains six internal and two external T slots enabling installation of various components inside (by fixings sliding into the slot) or enables fixing of the enclosure to a panel/wall or similar.
Upon request we´re able to provide you any of the two versions – 1455NHD1601 (natural elox) as well as 1455NHD1601BK (black).

Enclosure 1455 NHD won’t be scared by a hot summer – [Link]

Triacs – How to calculate power and predict Tjmax


An application note from NXP on how to calculate the power dissipated by the triac:

This Application Note describes how to calculate the power dissipation for triacs and Silicon Controlled Rectifiers. Thermal calculations are also included to help the circuit designer to predict the maximum junction temperature or calculate the required heatsink thermal resistance. Four worked examples ensure that all the power and thermal questions that arise during the design process are covered.

Triacs – How to calculate power and predict Tjmax – [Link]

Milk in Fridge – Internet of Things


by samsungite @ instructables.com:

I think that one day, all food cupboards & fridges/freezers will be smart. All products will have an RFID or video recognizable label which will update a list of product usage. Your local supermarket will gather this information & replenish your products as required – who knows ??

Milk in Fridge – Internet of Things – [Link]

50,000V High Voltage Power Supply


by Victor8o5 @ instructables.com:

This high voltage power supply has been designed to output a fixed voltage of around 50kV, it could easily be converted to an adjustable supply by connecting a variac in case of using transformers or by adding some extra circuitry to regulate the power going in. I initially thought about a high frequency PWM to regulate the power going into the capacitors, but I abandoned the idea. I found that adjusting the frequency is enough to make the voltage vary by a significant amount, allowing some control over it, this happens because the flyback must operate at a certain frequency in order to maximize the output.

50,000V High Voltage Power Supply – [Link]

Burning the Bootloader on ATMega328 using USBasp Programmer

ATmega328 Arduino bootloader

by openelectronicsproject.blogspot.com:

In this tutorial you’ll learn how to burn arduino bootloader on new ATmega328 using USBasp ISP programmer.Please be noted that every Arduino Board comes with a microcontroller ATmega328 pre-program with arduino bootloader firmware. Therefore, there is no need to burn the bootloader firmware again.But if you want to make your own DIY arduino board than you need to burn arduino bootloader into ATmega328. So here i’ll show you how to load arduino bootloader into atmega328 step by step.

Burning the Bootloader on ATMega328 using USBasp Programmer – [Link]