Energy monitoring using ATM90E26


Tisham Dhar designed an ATM90E26 energy meter breakout board which can be used in single phase power measurements.

After designing and testing the ADE7763 based Energy Monitor Breakout Board, I started looking around for cheaper and more modern alternatives.I came across the Atmel ATM90E26 Smart Metering IC with dual communication options – UART/SPI and multiple metering modes (tamper proofing with current sensing on live and neutral).

Energy monitoring using ATM90E26 – [Link]

RC snubber calculator spreadsheet


Paulo has developed an Excel-based calculator that eases the design of RC snubbers in power switching applications:

In power switching applications, a designer often has to contend with spurious oscillations. These are the result of parasitic capacitances and inductance on the board and behave like the step response of an RLC circuit. These transients can induced undesired noise in neighboring circuits and create over voltage spikes that can compromise long term component reliability.

RC snubber calculator spreadsheet – [Link]

IBM scientists achieve storage memory breakthrough


For the first time, scientists at IBM Research have demonstrated reliably storing 3 bits of data per cell using a relatively new memory technology known as phase-change memory (PCM).

The current memory landscape spans from venerable DRAM to hard disk drives to ubiquitous flash. But in the last several years PCM has attracted the industry’s attention as a potential universal memory technology based on its combination of read/write speed, endurance, non-volatility and density. For example, PCM doesn’t lose data when powered off, unlike DRAM, and the technology can endure at least 10 million write cycles, compared to an average flash USB stick, which tops out at 3,000 write cycles.

IBM scientists achieve storage memory breakthrough – [Link]

Interfacing 8×8 LED Matrix with Arduino


This tutorial will show how to interface a 8×8 LED matrix with Arduino. Example code is provided.

LED matrix displays can be used to display almost anything. Most modern LED sign boards uses various types of matrix boards with controllers. In this tutorial we are going to interface a single color 8×8 LED matrix with Arduino and display few characters in it.

Interfacing 8×8 LED Matrix with Arduino – [Link]

4.5Amps Bipolar Stepper Motor driver based on TB6600


Bipolar stepper drive board described here has been designed around TB6600HG IC. The TB6600HG is PWM chopper type single chip bipolar sinusoidal micro-step stepping driver. Maximum  Load 4.5A, Supply 10V to 42V DC.


  • Based on Single chip and Second chip for auto half current control
  • Suitable for Nema17, Nema23, Nema34 bipolar stepper motors
  • Suitable for 4Wires, 6 wires and 8 wires stepper motor.
  • Forward and reverse rotations available
  • Selectable Phase (Micro-step) drives 1/1, 1/2, 1/4, 1/8, and 1/16
  • Maximum Input supply 42V DC Minimum Input supply 10V DC
  • Output current 4.5Amps
  • Output Fault Monitor LED indicator
  • On Board Power LED indicator
  • On Board step pulse input indicator
  • Standby auto half current reduction circuitry onboard
  • Built in Thermal shutdown (IC)
  • Built in under voltage lock out (UVLO) circuit (IC)
  • Built in over current detection (ISD) circuit (IC)
  • Large capacitor to handle inrush current

4.5Amps Bipolar Stepper Motor driver based on TB6600 – [Link]

ODrive – High performance motor control


Oskar Weigl @ designed a brushless motor controller able to drive 2 motors.

Hobby brushless motors are incredibly cheap and powerful. However we need a way to make robots out of them. ODrive is that way.

Stepper motors are ubiquitous in hobby robotics projects: If you make a robotics or automation project today, it is very likely you will use them. Almost all DIY projects from 3D printers and CNC mills, to other kinds of projects like air hockey robots, use them. However in industrial automation, brushless servomotors have taken over, and it’s clear why: They don’t lose steps, are much more powerful, efficient, and silent.

ODrive – High performance motor control – [Link]

Development board for PIC16F1938


Raj over at Embedded Lab has designed a development board for PIC16F1938:

The PIC16F1938 is a versatile 28-pin MCU belonging to Microchip’s extreme low power microcontroller family featuring nanoWatt XLP technology, 28KB of programming memory, 1KB of RAM, 11 ADC channels, and tons of other peripherals. A while ago, I designed a development board for this MCU and I thought it would be worth sharing this design here. The development board features an onboard USB-UART bridge to support the ds30 Loader for easy programming of the PIC MCU. All I/O pins are accessible through 2×5 headers.

Development board for PIC16F1938 – [Link]

Build a Cloud-Connected ESP8266 Power Meter


Measure the DC power consumption of your devices on the cloud @

Controlling the electrical consumption in your home is one of the most important thing you can do, both because of environmental concerns & to reduce the electricity bill at the end of the month. There are countless of electrical power meters out there, but in this guide, I’ll show you how to build your own, and to use the ESP8266 feather board to measure how much power a single device is using. Note that this guide is about measuring power for DC (Direct Current) devices only.

Build a Cloud-Connected ESP8266 Power Meter – [Link]

Easy IoT weather station with multiple sensors


user Ingenerare @ published a tutorial on a IoT weather station based on NodeMcu board, DHT11/22 sensor, BMP180 sensor, Rain sensor, Light sensor.

In this tutorial, I will walk you through the steps to build an easy and cheap IOT weather station. The retrieved data is pushed via a wifi shield to Thingspeak. The data can be analysed on the Thingspeak channel or on a personal website as can be seen in the pictures above.

Easy IoT weather station with multiple sensors – [Link]

150V synchronous step-down DC/DC includes surge protection


Linear Technology designed the LTC3895 to be a non-isolated DC/DC controller with a high input voltage capability that can eliminate the need for surge suppression and operate continuously with a high input voltage.

The synchronous step-down switching regulator controller drives an all N-channel MOSFET power stage. Its 4V to 140V (150V abs. Max.) input voltage range is designed to operate from a high input voltage source or from an input that has high voltage surges, eliminating the need for external surge suppression devices. The LTC3895 continues to operate at up to 100% duty cycle during input voltage dips down to 4V, for transportation, industrial control, robotic and datacom applications.

150V synchronous step-down DC/DC includes surge protection – [Link]