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...  This is the first in a series of posts describing how I have used an IOT device (a little computer really) that connects to my block wide WIFI network and does really useful things. The basis ...
... approach is as follows: Wait 5 seconds on startup for things to settle Start receiving serial data from the GPS at 4800 baud looking for 0x0D, 0x0A,$ indicating the GPS is in the default ...
3. TRS80 Model 4 Fault
(JAQ/BLOG)
... the power on pins 11 (VCC) and 29 (VSS) of the Z80 (U57).  This read 4.7 volts... a little lower than I expected but was consistent if I powered the main board from either power supply so I assumed ...
... and spent a lot of time using the department machines while I was waiting for my ride home.  Even in the 1990's the PDP8e was still operational and lived in a little "computer room".   From ...
... 74HCT244 are tried to ground to prevent oscillation. The 74HCT244 is run at 5V.  The 74HCT is a CMOS device that uses TTL logic levels on it's inputs.  This means that >2V on one of ...
... on prototype board as long as you take your time and keep your interconnect wires short.   The hardware uses a Z80-SIO to provide two serial ports (with TTL to USB adaptors on my build). ...
With most computers no longer having a serial port, a TTL Serial / USB interface is required for many microcontroller projects. I have had good results with the low cost eBay modules based on ...
...  The end result looks very smart. The two serial interfaces use CP2102 USB/TTL Serial interface adaptors purchased on eBay for a couple of dollars.  They work well in this application easily ...
... Compact Flash to IDE Adaptor on eBay (approx US$ 2).   I have been testing the board with 2 x MAX3232 based TTL to RS232 converter boards.  Replacing these with CP2102 based TTL to USB Serial ...
... circa 1979 but combine this with 128K of Static RAM, 128K of Flash and a 128M compact flash drive, over clock it to over 7 mhz and you have a little CPM machine on a single board with capabilities that ...
... output is a little high at 5.5v but I understand that these do not have great regulation when not under load so this will likely come down with 10 PC boards to power. The other +5V supply didn't ...
... a great starting point for a signal generator project but are a little short on documentation. The pinout and relationship to AD9850 pins is as follows:   Board ...
The cheap AD9850 DDS modules currently available on eBay are a great starting point for a signal generator project but are a little short on documentation. The pinout and relationship to ...
... Sender and Receiver are available here.  The Receiver uses a TTL output to indicate the bore running state.  By querying every 5 minutes and storing the data in a MYSQL database on my server ...
... parts... the level conversion was easy... standard MAX232 design but additional interfacing was required to covert the two line TTL serial to one line to suit the FT-7800R.  I discovered this design ...
... doesn't say is that there is an onboard serial port (even provided with soldered pin headers) which is perfect (with level conversion from RS-232 to 3.3V TTL) for connect to an TNC. Using a DSL-502T ...
... choice of 3 colors. The programming software (while typical of software written by hardware engineers so the UI leaves a little to be desired) is easy to use and is the quickest way to get the radio ...
...  symbol POWER = 4 ' Constants - Other symbol SENDDELAY_H = $300 symbol SENDDELAY_L = $5 symbol FASTTXLIMIT = 48 symbol POWERSETTLE = 150 ' Variable Usage  ...
... a self contained APRS unit. There was plenty of enthusiasm for the project.... so much so that we ran out of PCB's.... so I built my OpenTracker using a DSE Prototyping board... a little more time ...
20. Take a Message....
(JAQ/BLOG)
... anniversary of the Battle of Britain in 1940.  Among the aircraft that flew that day was Miles Messenger IIA ZK-CMM.  The Messenger was owned by the late Dave Cowie and is flown ...
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Contact Andrew Quinn

jaquinn@ihug.co.nz http://twitter.com/jaquinn