CMOS Camera – P7: Streaming Lossless RAW Compression

Now this post will be for some serious stuff involving video compression. Early this year I decided to make a lossless compression IP core for my camera in case one day I make it for video. And because it’s for video, the compression has to be stream operable and real time. That means, you cannot save it to DDR ram and do random lookup during compression. JPEG needs to at least buffer 8 rows as it does comp ...

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Pick and Place

Designing a simple and cheap temperature logger. Part 4: The junk in the trunk. Posted on February 3, 2012 I somehow managed to solve the problem of the serial flash memory write block size vs. the erase block size. I just had to write a custom FAT12 filesystem.. As seen before, the Temperature Logger will act like an USB memory stick. There will be at least two files. One with the time stamped temperature ...

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EAGLE: Panelizing made easy

Today I stumble across a neat/new feature in Eagle I haven’t seen before. Prolly in there since early versions 7, but at least it is present in version 7.5.0 (current version at writing is 7.7). Some PCB manufacturers will accept panelized PCB and you can save a few bucks by combining a few small designs into a larger design. This will save cost and the environment. Panelizing is done by machining a slot be ...

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ARDUINO-BASED TWO-WAY PAGER

This Arduino-based pager by  Mike Schaus will allow you to send and receive real SMS text messages. This messaging device has its own SIM card and phone number. 4 January, 2017elab 2128 1 This Arduino-based pager by  Mike Schaus will allow you to send and receive real SMS text messages. This messaging device has its own SIM card and phone number. In order to build this project you need the following parts: ...

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Maxim adds mosfets to ‘smallest’ DC-DC converter

Description Create a design and simulate using EE-Sim: [MAX15058] The MAX15058 high-efficiency, current-mode, synchronous step-down switching regulator with integrated power switches delivers up to 3A of output current. The device operates from 2.7V to 5.5V and provides an output voltage from 0.6V up to 94% of the input voltage, making the device ideal for distributed power systems, portable devices, and pr ...

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PIC Microcontroller based resistor decade box

I was thinking about making a resistor decade box, but I found the rotary switches that are used in these most of the time rather expensive and a bit old fashioned. That's why I decided to use a rotary encoder and select the resistors with a microcontroller. Now I only had to find a way to "make" the resistance. Switching resistors with transistors or mosfets gives a high switch resistance and can't handle ...

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More Awesome DoorBell Control

UPDATE: I eventually decided to use a single switching regulator that I found on digikey which is both awesome and well priced. See this blog post update about it. My first DoorBell Mote prototype was working nicely and it allowed monitoring the door bell (while also triggering it remotely – toddlers love it). But I wanted more. On weekends the family likes to get a well deserved nap during the day and ofte ...

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10A with 96% efficiency … no problem for TLF51801

Modern DC/DC controllers from company Infineon, like TLF51801ELV manage even big challenges. Perhaps everyone knows, that modern switch-mode power supplies are able to efficiently convert voltage and to replace linear power supplies. Features of ready-made DC/DC modules as well as SMPS controllers themselves are still better and nowadays it´s no problem to construct a 10A power supply on a small area. It is ...

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Intersil claims to have smallest pico-projector

Description The ISL9307 is an integrated mini Power Management IC (mini-PMIC) ideal for applications for powering low-voltage microprocessor or multiple voltage rails with a battery as an input source, such as a single Li-ion or Li-polymer. ISL9307 integrates two high-efficiency, 3MHz, synchronous step-down converters (DCD1 and DCD2) and two low-input, low-dropout linear regulators (LDO1 and LDO2). The 3MHz ...

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Energy Wristband

Introducing... the Energy Wristband A wristband that tells you energy changes in your home. It connects via a Raspberry Pi computer to a base station like a'current cost' or similar. When a change in energy usage occurs, the wristband vibrates and a small LED bargraph shows your current usage from 1 to 4. Realtime energy use can be queried by pressing the button.     Temporary ownership = maximum ...

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