Search results for "arduino"
This is (PART 2A & 2B) of the project “Arduino Frequency Display For a Kenwood TS-520S HF Ham Radio”. This part covers small signal amplification of a 0.2 volt peak-to-peak 5.5 MHz signal into Schmitt triggered NAND gate for cleanup before being cleanly counted by the Arduino. Links to all parts: (PART 1), (PART 2), (PART 3), (PART 4), (PART 5)
(PART 2A)
(PART 2B)
Here are the datasheets for the two chips I used in (PART 2)
74HCT132 Quad 2-input NAND Schmitt trigger (PDF)
NE592 video Amplifier (PDF)
Thanks for joining!
Photo Gallery
CLICK PHOTO for gallery view and click a SECOND time for hi-resolution image. Click thumbnails on lower right and lower left of gallery to navigate gallery photos.
Thanks for joining!
This is (PART 1). Links to all parts: (PART 1), (PART 2), (PART 3), (PART 4), (PART 5)
A friend has a Kenwood TS-520S HF (high frequency) ham radio. He does not have the optional DG-5 frequency display and calibrating the dials between bands is not much fun. He gave me some information about the DG-5 and through some review I believe I can make a substitute for the DG-5 using an Arduino, LCD Shield and hand full of chips.
He could buy a DG-5 but that would cost more than he paid for the whole rig and it really is not necessary to use the radio, just more convenient.
This is part one so watch this video which covers my idea and some pre-testing. All looks good so far and I’m already working on part two.
I got the Arduino frequency library from this site:
http://interface.khm.de/index.php/lab/experiments/arduino-frequency-counter-library/
In the video I just use the library example scketch so I have no code to share in part 1.
I also followed some circuit examples shared at these two sites which both built HF frequency counts and were great sources of information to help me on my way to building an Arduino derivative HF frequency counter. My counter is for a single custom application and so doesn’t incorporate all the features these other builds include.
http://aade.com/DFD2inst/DFD2inst.htm
http://www.avr-asm-tutorial.net/avr_en/fcount/fcount_m8.html
Arduino website to get development software and sample code:
I got my Arduino and LCD shield from Adafruit.com
http://www.adafruit.com/products/50
http://www.adafruit.com/products/714
Some chips and data sheets I have used in part one:
CD74HCT93
Used in 3 bit binary ripple counter mode for divide by 8 with input at CP1 and output at Q3
http://www.ti.com/lit/ds/symlink/cd74hc93.pdf
CD74HC153
Dual 4 to 1 Line Selector/Multiplexer
http://www.ti.com/lit/ds/symlink/cd74hc153.pdf
Here are some photos of what I covered in part one. CLICK ON PHOTO for hi-resolution image.
I have a custom Arduino board project to share including bonus steps at the end on how to program a blank ATmega168 or ATmega328 with your Arduino sketch directly from the Arduino IDE environment using an USBTinyISP programmer from Adafruit.
I’m going to hack a Christmas photo frame I got a few years back when my son visited Santa Clause. The photo of him sitting on Santa’s knee came with a nice frame that had 5 LEDs that flashed when you turned it on. It ran on two AAs and used a “chip-on-board” to control the flashing pattern of the LEDs.
The problem was that this thing flashed all 5 LEDs four times a second! We could never leave it on because it would drive you nuts. Ever since I purchased it I have wanted to hack it so the lighting was not so annoying. This is going to be mostly a video posting but I will put in some “how to” notes, helpful links, photos, circuit and code so it will be more useful to you for adding such a hack to a project of your own.
Below is a video of me describing the problem and proposing the project. A few things did change after the video but I will note the changes below.
Below is the original board from the photo frame. The “chip-on-board” is under the black blob.