Summary Since the code and electronics are working now, I am considering work on this project to be complete (well, for the time being at least). What follows are thoughts on follow-on projects and future directions. Deets This project began primarily...
I will need 20V for one of the ink cartridges (HP C6602A). So I need to step up my voltage from 12V to 20V. Here I use a step-up dc-dc converter around MC34063 (from UTC in this case).Multiple datasheets for MC34063 are available, e.g.:http://www.onsemi.com/pub/Collateral/MC34063A-D.PDFhttp://www.ti.com/lit/ds/symlink/mc33063a.pdfEven...
This log covers a mechanical fitup test of the bricks and hardware for the main body of the kiln. The heater coils and a wiring cover are still needed - they should appear soon in a later update. The image below shows the metal parts out of the box from...
Introducing "makerPower MPPT Solar Charger"Engaging with Crowd Supply has been interesting. They see this device from a fresh perspective and that has resulted in some changes. One is the name. To me "Solar MPPT Charger" (or "MPPT...
The following dimensions will be on the cold plate only, and not including the solderd-on heat pipes. The bottom side of the cold plate is recessed - maybe due to shielding - but anyhow, if you assume the corners are not radiused, this cavity is 1.25"...
Records weight in the morning with MQTT if weight measurement above a threshold and exactly the same for 2.0 secs after adding 0.05 and then truncating digits to the right of 0.1 lb. Displays recorded weight then "Sent" when conditions met. ...
After years of maglites, $1 flashlights, $1.25 flashlights, custom LED lights, phone lights that all came up short in some way, it was time to try another custom solution. 25 years ago, it was acceptable to burn $20 on a gigantic maglite. ...
SENDERThe sender is compact (1.25 sq. inch) and operates from 1.8 to 5.5 V. The module consists primarily of an Atmel ATtiny84A which monitors the inputs and outputs the data. A red and green LED provides visual status.The sender module has:Five analog...
Revisiting Control DelaysAs discussed in the last log, feedback lag is a major concern. Most introductory control system courses focus on single input-single output (SISO) linear systems. For these simple systems, there is a mountain of theory that can...
I am working on a VFD clock project and I needed a way to vary the brightness of the display. The VFDs are either too bright or too dim on a fixed voltage. They also have a tendency to ghost at high voltages which is very noticeable in low light....
Insert five additional wires through the grommet on the top cover of the box. I cut over-sized wires so I can cut them to size later. The colors do not matter, but I like to have one red wire for the positive connection. On the top cover of the Raspberry...
In the past I have compared a linear (MCP73831) with a couple switched mode (LT3652, BQ24650, CN3722) Li-Ion battery chargers, powered from solar panels, and found linear chargers actually don't perform so bad. Andreas Spiess concluded the same in this...
(UPDATE 20160822: added addendum below) As a second iteration of the design, I built a prototype of an automated measurement system. The design may not be optimal, mainly because I just used parts I happened to have around. On the other hand, I've been...
What is Bone Conduction?"Bone conduction is the conduction of sound to the inner ear through the bones of the skull. Bone conduction transmission can be used with individuals with normal or impaired hearing...In use, the speaker is strapped against one...
So far I've gone for the STM32F446VET6 a LQFP100 Cortex M4, I switched away from the LQFP64 because I wanted the option of using the FMC for external RAM, probably muxed PSRAM.I use Eagle for these type of layouts, and I don't have a part already for...