In this project, instead of using a standard embedded processor and programming it to execute 3 tasks at hand (parsing HEX character stream, generating HEX character stream, and writing character stream to video RAM driving VGA), I created 3 independent...
I must confess I haven't spent much time looking at NTC curves before. My prior knowledge was that they are somewhat ill-defined and can only deliver reliable measurements when calibrated individually. source: https://support.belimo.us/Documentation/Standards-Compliance/957165601/What-is-the-difference-between-NTC-10K-Type-2-and-Type-3-sensors.htm...
While whizzing through the keyboard stuff, there is some special handling of some keystrokes. This is by scan code, so it's difficult for me to puzzle out what they are. One exception, though, is for setting the 'send speed'. There...
The end goal for the Autodro is a complete monitoring system for under $10. This means that cheaper, simpler, less accurate sensors are needed. I've started with a simple EC sensor, and am hoping to design something around $1.So far, I've created a sensor...
With the new harvest, I estimate that the perfect and maximal orbits under m=1M is around 100K. This starts to make quite a large .h file to include in the sieve generator. Not that it's such a concern but scalability, you know.... And embedding such...
There are some options for assembling 6800 code today. Ideally, a cross assembler would be good from Windows. Herb Johnson has adapted William C Colley III's A68 6800 cross-assembler. The A68 assembler runs in DOSBOX under Microsoft Windows. Output Format...
I just got the pH portion of the circuit working. There actually wasn't anything wrong with the circuit. It turns out that the probe that I was initially was using was bad. I tried a different brand and it worked perfectly. The working probe is listed...
I uploaded a copy of the BASIC program that ran the system. The important part was this, which I annotated what it did. With this Information and finding the interface to the spectrometer is a 48 line DIO board I was able to figure out what lines did...
Any enclosure needs to be easy to access yet provide enough space to get all of our cables in and out without being too big. A tough challenge!---------- more ----------Once our technology solution is chosen, we have to mount it, cable it, make it all...
For some reason, EC probes are relatively expensive. In most cases they are more expensive than pH probes, which to me seem a lot harder to make. So, I decided to make my own EC probe, as you can see below:The contacts are gold plated Studex ear piercing...
I measured values on pin A1 of the ISO 10487 connector. Here you are the measured values: Speed (km/h)Pulse duration (μs)30~1300040~1000050~770070~540090~4200100~3750100~3400120~3200 It can be calculated more accurate values with "distance = speed...
After I convinced myself that the emulator was probably OK, I turned back to the ROM. But after I found yet another ROM image online, and it turned out to be identical to the other three, I have to rule out bad ROM as well. Just as well as I was...
Wiring up the AM2901 to the Arduino Mega and getting a responce. To start out I have only wired access to 2 of the address lines for the registers. The output port from the AM2901B was held enabled. Wiring MegaAM29012,34,567A0,A1B0,B1ClockCarry...
Having found the send speed setting, I got a bit interested in the file sending process itself. Tracing back a reference to "Sending....Press any key to stop. " text, I find sub_F013:F013 ; XXX prepare to send (flags and prompt) F013 sub_F013:...