9V to 1kV DC/DC converter

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Bob tipped us with his latest project, it’s a 9V to 1kV DC-DC converter using CD4011 IC to produce a square wave and a IRF530 transistor to drive the transformer.

Finally, I have made a new high voltage supply based on an inverter transformer and voltage doubler. It seems to be ok for this job, but it can be used in various other applications so I’m presenting it in a separate entry.

Warning! the device produces high voltage that can be lethal, if you want to build it, please take cautions.

9V to 1kV DC/DC converter – [Link]

Dual DC Motor driver using two L293D

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Dual DC Motor driver using two L293D IC. The L293D device is quadruple high-current half-H driver. The 293D is designed to provide bidirectional drive current up to 600mA a voltage from 5V to 36V. It provides 600mA +600mA on each channel suitable for mini hobby robots. The board been designed mainly for small size robot, however this can be used for other application where two motor control required. L293D includes the output clamping diodes for protections. Each channel required two input signals PWM and DIR for full control. Separate logic supply to reduce dissipation.

Specifications

  • Motor/Logic supply 5 to 36 V
  • Logic controls input 7 VDC max
  • Inhibit facility/enable
  • PWM Frequency 5KHz Maximum
  • High Noise immunity
  • Over temperature protection
  • Capable of delivering output current up to 600 mA per channel
  • The control/interface lines are accessible with Berg connector
  • Header connector for motor and supply connection

Dual DC Motor driver using two L293D – [Link]

Getting Started With the ATMega328P

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Here is a detailed guide on how to get started with ATMega328P microcontroller. The guide goes in details on how to setup it on a breadboard and how to upload your first code on it. and blink a led.

The real benefit of using this microcontroller is that it’s only $4 US, whereas many other micro-controllers are 10X that price. It can also be easily programmed in the universal programming language, C++. The ATMega is also equipped with a decent amount of memory for any project.

Getting Started With the ATMega328P – [Link]

Build an 8-Bit Heart with MeowCAD

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You can find some interesting projects on MeowCAD and one of these is a“8 Bit Heart”. MeowCAD is an online, in-browser electronics design tool that’s completely free and open source. Use it to create schematics, printed circuit boards, share with your friends or just play around.

At some point, after you design your schematics and boards, you want to submit them to be fabricated. Whether you use MeowCAD or some other tool, the workflow is pretty similar. We live in a pretty amazing time where this can be done for reasonable cost with only a few weeks delay.

Build an 8-Bit Heart with MeowCAD – [Link]

IoT IP camera teardown and getting root password

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Jelmer @ jelmertiete.com did a teardown on a cheap IP camera and also obtained the root password of it with the goal to investigate the security of such a devices. He writes:

IP Cameras have become extremely cheap in the last couple of years. Mass production made the prices of decent quality image sensors, and very capable SoCs, drop significantly. Our victim in question is currently still available for about €43, but clones/copies/similar models are available from China for even cheaper.

IoT IP camera teardown and getting root password – [Link]

DIL-Duino – Arduino in a DIL shape

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DIL-Duino is a complete Arduino environment in a DIL-8 form factor based on the DigiSpark Hardware. by Daniel Grießhaber:

DIL-Duino uses the QFN Version of the ATTiny85 and a USB Bootloader to provide the easy to use Arduino stack in a single DIL-8 Package Footprint.
To fit the Micro-USB socket on the board, it was necessary to make the actual board bigger than the DIL Package, but after development the Board is perforated to break the USB Socket and get the desired footprint.

DIL-Duino – Arduino in a DIL shape – [Link]

ESP8266 superfast flashing: flash ESP in 5 seconds

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Deomid Ryabkov introduces us a method of flashing ESP8266 in 5 sec. To achieve that he used a modified ESPTool. More details on the link below.

If you are developing for ESP8266, you may be familiar with esptool, which is a tool that you use to upload your code to the device. And it will do so, but if, like Smart.js, your firmware is non-trivial in size, you’ll be waiting a non-trivial amount of time for it to upload:

ESP8266 superfast flashing: flash ESP in 5 seconds – [Link]

LiFePO4wered/Pi – LiFePO4 battery for Raspberry Pi

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Patrick Van Oosterwijck has published a LiFePO4 battery solution for Raspberry Pi that will also act as UPS power supply:

The project is built on top of a LiFePO4wered/USB module. A small board is added with an MSP430G2131 microcontroller that takes care of monitoring input and output voltage, monitoring a PCB touch button, driving a power indicator LED and switching the load (the Raspberry Pi power). The microcontroller is also connected to the Pi’s I2C bus and monitors the Pi’s running state. The small board connects to 8 of the Pi’s GPIO pins but leaves the rest free to allow prototyping using fly leads.

LiFePO4wered/Pi – LiFePO4 battery for Raspberry Pi – [Link]

External antenna modifications for the Raspberry Pi 3

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In this post dorkbotpdx.org show us a couple of different ways that an external antenna can be added to the Raspberry Pi 3.

It’s not clear why an external antenna is not an option for the Pi 3, there are a number of possible reasons and I don’t presume to know the Raspberry Pi Foundation’s exact rationale. It could be to improve the out-of-box experience, an integrated antenna “just works” and there’s no potential for the antenna connector to be broken plugging in an antenna. It could be to reduce complexity, the unit with an integrated antenna is compact and self-contained.

External antenna modifications for the Raspberry Pi 3 – [Link]

Teensy 3.2 VS Arduino Due and Arduino Mega. Which one is faster?

our friends at educ8s.tv wanted to test out how fast the  Teensy 3.2 is, so he build the project above.

I wanted to find out if Teensy 3.2, despite its small size, is faster than the Arduino Due, the fastest Arduino board available today. So I build a simple project where both boards run the same sketch, the Newton’s approximation of Pi for 500.000 iterations. Which one is faster? The board that finished first. Teensy or Arduino Due?

A few weeks ago, I published a video about the impressive Teensy 3.2 board! The specs of the board look fantastic! It uses a 32bit ARM processor that can run at 96 MHz and has plenty of memory for our projects. From the specs I thought that the performance of this tiny board would be similar with the performance of an Arduino Due which is the fastest Arduino board available today. But is that right? Let’s find out.

Teensy 3.2 VS Arduino Due and Arduino Mega. Which one is faster? – [Link]