LC709501F – Li-ion, intelligent charge controller for next-generation power banks


by Graham Prophet @

ON Semiconductor has introduced a highly integrated single chip power bank charge controller for the development of next generation Li-Ion powered products. The LC709501F provides broad power and voltage/current output range of 5V, 9V and 12V operation, with a maximum charge/discharge capability of up to 30W through FET selection.

LC709501F – Li-ion, intelligent charge controller for next-generation power banks – [Link]

433MHz wireless module configuration


Dziku discuss how to configure a cheap 433MHz wireless module for serial communication:

HC-12 are cheap 433MHz wireless serial port communication modules with a range up to 1800m in open space. Each costs about $5 when bought from China, and 2 of them can create wireless UART link that can be used, for example, to transfer telemetry data from UAV. Or drive IoT device. Or connect sensors. Or whatever else one can think of.

433MHz wireless module configuration – [Link]

$4 Coin-sized Linux Computer with WiFi

VoCore is a small Linux computer with Wifi that can work as a full functional router. It runs OpenWrt on top of Linux. It contains 32MB SDRAM, 8MB SPI Flash and uses RT5350 (360 MHz MIPS) as its heart. It provides many interfaces such as 10/100M Ethernet, USB, UART, I2C, I2S, PCM, JTAG and over 20 GPIOs but its size is less than one square inch (25mm x 25mm). VoCore was launched in 2014 in a crowdfunding campaign and eventually it was 1937% funded! The $20 module had a lot of fans but most of them, such as students, were not able to afford it.

Designers of VoCore came up with a great solution!vocore2-raw-3-768x512 VoCore2 Lite is the newest product of the Chinese startup for just $4! A Coin-sized Linux computer, smart router and it is fully open source. With such an affordable module, wireless life will become easier and it will push forward the development of new IoT applications.

It is now live in a new crowdfunding campaign and again it is exceeding expectations with 400% funds in the first 10 days!
Campaign video

It has 300Mbps WIFI, 5 x ETHERNET, USB 2.0 Host, 3 x UART, 1 x SD, 2 x High Speed SPI, 3 x I2C, and 40+ GPIOs. It can be programmed in C, Java, Python, Ruby, Javascript and etc. It has various of docks and thousands of software to enhance its functions and the wireless life.

VoCore2 Pinout Diagram
VoCore2 Pinout Diagram

“People may ask, is that price lower than the cost? The answer is it is not, but it is very very very close to the cost, and only for us with the experience of production VoCore2(we reuse  the VoCore2 tech, test jig, test app, to save cost etc…). Just hope students and other cost sensitive people will have a chance to play with the most advanced IoT board.” – Qin Wei, VoCore co-founder

Using VoCore2 as a router

Compared to Vocore2, Vocore2 Lite has a cheaper Mediatek MT7688N MIPS processor, less memory and storage, WiFi is limited to 150 Mbps and an external antenna is required. With only 74 mA power consumption, VoCore2 will be more efficient than ESP8266, that consume around 250 mA, and it will be easily implemented in various projects.

This is a comparison between the three editions of VoCore


The crowdfunding campaign still have 1 month to go and  you can pre-order VoCore2 ($12), VoCore2 Lite ($4), and other docks starting from $29.

More details, updates and resources can be reached at the official site , the documentation, and the blog.

$15 Arduino-Based Reflow Oven Controller

A reflow oven is one of the most useful tools for hardware developers, a machine used primarily for reflow soldering of surface mount electronic components to printed circuit boards (PCB). ESTechnical, a hardware manufacturer based in UK, works hard to produce open source hardware gadgets and contribute its best to make the hardware tools much better, had made a great product, the $15 Reflow Oven Controller. Having an Arduino based reflow oven controller with a graphic LCD opens up a world of possibilities to solder surface mount devices.

cyclewithoverflowThis reflow oven is built around the Arduino Pro Micro, an Adafruit TFT color LCD, and around two solid state relays, one for the heating elements and one for the convection fan. The board contains a very simple Zero crossing detection circuit, used to align control logic to mains frequency, two MAX31855 thermocouple-to-digital converters and two Sharp S202S01 PCB-mount solid state relays, mounted on Fischer SK409 50,8 heat sinks.



The Arduino-based reflow oven controller comes with:

  • PID loop control
  • Wave Packet and Phase Fired control for AC outputs
  • graphic TFT LC-Display, drawing the temperature curves
  • solely controlled using a cheap rotary encoder and its single button
  • stores up to 30 temperature profiles in EEPROM
  • configurable PID-parameters
  • simple, small hardware to drive loads up to 600V and up to 8A
  • hardware can
    • measure two temperatures independently
    • drive two AC loads, such as heater and fan
  • Note: Requires Arduino IDE 1.5.x or newer

The software uses PID control of the heater and fan output for improved temperature stability. The heater AC load is controlled using Wave Packet control in order to minimize RF interference and load on the relay. For the fan motor, Phase Fired control has been implemented.

In order to fit your ESTechnical Reflow Oven Controller to T962A, SMTHouse reflow oven infrared IC Heater soldering machine, you will need some tools that are not included in the packing list. You can check the Reflow Oven Accessories Package.
Detailed steps of the installation process are listed here.

T962A Reflow Oven
T962A Reflow Oven

To follow the tutorials make sure of each step or get help from an expert because this project operates with possibly lethal mains voltage.

More details and documentation are available at Github and at ESTechnical official website.

Raspberry Pi action camera

Action cameras are light and portable camcorders that are great for filming outdoor sports and activities. While there are varieties of commercial action cameras available in the market, makers and tinkerers prefer an alternative route of making their own version of any piece of hardware. Connor Yamada‘s Raspberry Pi based DIY action camera can shoot both video and still photos using a Pi camera board and also features integrated bluetooth and wifi modules for file transfers. A 3D-printed durable enclosure is used to house everything including a high-capacity (2000mA-hour) rechargeable battery that would give multi hours of recording the outdoor fun. The camera also includes a LiPO charger and voltage booster module for easy charging of the battery through a micro USB port.

Raspberry Pi action camera
Raspberry Pi action camera

In order to obtain the compact form factor of an action camera, all the peripherals must be fit as tightly as possible inside the enclosure. Connor tried to keep the size of the enclosure not to exceed that of the Raspberry Pi A+. Because the USB WiFi module can easily stuck out quite a bit when inserted in to the USB port, he managed to remove the USB jack with some side cutters and solder a ribbon cable to the exposed USB lines to connect the WiFi adapter directly to the board. He also hot glued the Bluetooth module on the top of the Raspberry Pi board and ran another ribbon cable to connect it to the serial port pins. Two pushbuttons with slightly longer pieces of cable provide basic control functions for the camera. Following video shows some test recordings of this action camera.

Attiny2313 & Attiny84 V-USB Media Volume Control


Rupert Hirst shares his thoughts on creating a V-USB based media volume control:

Although you may think a rotary encoder is just a rotary encoder, when selecting one for a specific purpose such as a volume knob, the feel  and quality can play a large part in your design decision. You only have to look at the vast part numbers in any given range to appreciate this.

Attiny2313 & Attiny84 V-USB Media Volume Control – [Link]

A first look at Sense Hat add-on board for the Raspberry Pi uploaded a new video on Raspberry Pi Sense Hat Tutorial:

Dear friends, in this tutorial we are going to take a first look at the impressive Sense Hat add-on board for the Raspberry Pi. It was developed for the Astro Pi mission and 2 of these boards are deployed to the International Space Station. Let’s start!

The Sense HAT is an add-on board for Raspberry Pi, made especially for the Astro Pi mission – it launched to the International Space Station in December 2015. Yes, two Raspberry Pies with 2 Sense Hats were actually sent to the International Space Station and performed experiments with code that was written by students! Amazing stuff!

A first look at Sense Hat add-on board for the Raspberry Pi [Link]

Introducing the BMP180 barometric sensor


A how-to on using the BMP180 barometric sensor with the Arduino @ Random Nerd Tutorials:

The BMP180 barometric sensor (model GY-68) is the one in the following figure (front and back view). It is a very small module with 1mm x 1.1mm (0.039in x 0.043in).
It measures the absolute pressure of the air around it. It has a measuring range from 300 to 1100hPa with an accuracy down to 0.02 hPa. It can also measure altitude and temperature.
The BMP180 barometric sensor communicates via I2C interface. This means that it communicates with the Arduino using just 2 pins.

Introducing the BMP180 barometric sensor – [Link]

Flash Firmware To ESP8266 WiFi Module the easy way


This tutorial is for helping you to flash firmware in your favorite ESP8266 module. First i small introduction to ESP8266:

The ESP8266 is a low-cost Wi-Fi chip with full TCP/IP stack and microcontroller capability produced by Shanghai-based Chinese manufacturer, Espressif. The chip first came to the attention of western makers in August 2014 with the ESP-01 module, made by a third-party manufacturer, AI-Thinker. This small module allows microcontrollers to connect to a Wi-Fi network and make simple TCP/IP connections using AT commands. It also has a decent amount of internal memory (512kb-4mb), so it can also be used as a standalone IoT device with lesser number of GPIO pins.

Flash Firmware To ESP8266 WiFi Module the easy way – [Link]

Tiny Wireless Capsule Camera


A tiny wireless capsule camera for medical imaging or space-constrained environments. by Ryan Bailey @

Tiny, pill-sized cameras are frequently used in the medical field to visualize the gastrointestinal tract, particularly areas not readily accessible by bulkier devices. Increasingly, consideration is given to using these devices in patients who cannot tolerate, or are otherwise unwilling to undergo, a conventional colonoscopy. The possibility of displacing or augmenting these methods with tiny, non-invasive devices is very exciting.

Tiny Wireless Capsule Camera – [Link]