July 15, 2018, 8:00 pm
I recently found a Hittite (acquired by Analog Devices in 2014) HMC624LP4E evaluation board gathering dust in my miscellaneous PCB bin and thought it might be a great little project to add a microcontroller interface to it so I can use it as a convenient digital attenuator in my lab. The HMC624LP4E had been replaced by Analog Devices’ HMC624A-EP but these two chips are mostly identical so everything described in this post can be applied to the newer HMC624A as well. Continue reading ‘Controlling an HMC624LP4E RF Attenuator Using Arduino’ »
November 13, 2017, 10:29 pm
As mentioned in my previous post, besides the broken LCD there was also an issue with the power supply portion of the unit and the output voltage was clamped at around 10 to 11V. The digital circuitry portion however seemed to be intact. Unfortunately since an identical LCD is virtually unobtanium, I thought I’d reverse engineer the LCD protocol so once the power supply is fixed I can fix the display by hooking up a different LCD. Continue reading ‘Reverse Engineering of BK Precision 1696 Switching Power Supply’s LCD Protocol’ »
Tags:
7 Segment,
BK 1696,
BK Precision,
LCD,
NJU6433F,
Programmable Power Supply,
Protocol,
Reverse Engineering,
SDP,
SPI,
Switching Power Supply Category:
Electronics |
5 Comments
June 4, 2017, 11:45 am
I recently upgraded my home phone system and thus was left with a couple of old Uniden DCT648-2 handsets. Most of the components inside are probably not salvageable but these handsets use 3×16 character LCDs, so it would be nice if I could reuse them in my other projects. Continue reading ‘Reverse Engineering a Uniden Cordlessphone LCD’ »
Tags:
Arduino,
Atmega328P,
Cordless Phone,
DCT648-2,
Handset,
LCD,
Logic Analyzer,
Protocol,
Reverse Engineering,
SPI,
Uniden Category:
Electronics |
9 Comments
March 1, 2013, 5:00 am
In my earlier posts (1, 2, 3), I showed some examples of using the I2C protocol with TI’s MSP430 Launchpad. Many MCUs in the MSP430G2 family also support the SPI bus. In today’s discussion, I will give a couple of examples on communicating with an SPI port expander (MCP23S17). Continue reading ‘TI MSP430G2 SPI Examples’ »
July 25, 2012, 8:46 pm
Microchip‘s MCP4821/MCP4822 is a low budget 12-bit digital-to-analog converter. MCP4821 is the single channel version whereas MCP4822 has two channels that can be latched simultaneously. Both chips have internal band gap references and can be controlled via SPI. Continue reading ‘Code For MCP4821/MCP4822’ »
May 2, 2010, 8:21 pm
ATmega328p does not provide any Digital/Analog conversion channels (although the D/A conversion can be simulated by means of measuring the PWM output). We can easily add up to eight D/A channels using either a LTC1665 (8 bit) or LTC1660 (10 bit) from Linear Technology. Continue reading ‘A Library for LTC1665/LTC1660’ »
April 16, 2010, 9:03 pm
LIS3LV02DL is a MEMS three-axis digital linear accelerometer that provides both I2C and SPI interfaces for communicating with microprocessors. My work here is largely based on the work done at Near Future Laboratory. Instead of using a commercially available LIS3LV02DQ break-out board (LIS3LV02DQ is QFP packaging equivalent of LIS3LV02DL), I chose to hand solder an LIS3LV02DL (which is uses LGA packaging). And I have made some changes to the code sample to support more functionality. Continue reading ‘Interfacing LIS3LV02DL Using SPI — I’ »