Recent content by domwild

Hi, AXE401 shield, 12V supply, is 1.8V a correct reading for VREF? In my confused mind I always thought 5V is the reference voltage as the voltage regulator in my 12V system would supply that. Looks like the 28X2 needs the adcsetup command to make all the pins usable for analogue input. I want...

Hi, To make a 9-12V supply for this proto board requires a "2.1mm centre (tip) positive connector", so the manual says. To buy the plug requires a little bit more than that, namely internal-, external diameter and shaft length of the plug. Anyone with a black belt in electrickery to supply that...

Hi, Old proto board, had 28X (PIC16F873A-1) installed and as there was a message re outdated PIC I installed a 28X2 (PIC 18F25K22) chip into this old proto board. First mistake?? Used old RS232 to stereo plug cable that came with this proto board. Windoze 7 claims the COM1 port is OK. Settings...

Hi, Had an old AXE022 proto board with a 28X in it. My Windoze 7 PC no longer has an RS232 port, so my son gave me his USB to RS232 cable. The Picaxe software seems to recognise the cable on COM14, COM15 and COM16 but checking the Firmware version fails as it cannot detect the hardware. Can I...

Hi, Bought this board some years back and now am coming back to it. The numbers and even letters of the labels (pins) have been overprinted by the three rows of "gold" plated holes. A 28X has been plugged in. This is what I can see with the power supply, RS232 socket at the top: Left hand...

Haxby, Thanks for your July 2008 answers re stacked PSUs and windmill MPPT. Sorry for not thanking you before. Q1.: Stacked PSUs: Pls elaborate, you mentioned if one uses stacked PSUs, then it needs a small modification to do it safely. Q2.: "PSU takes DC inputs from 90 to 350 V, check...

Hi, Windmill MPPT is a complex problem unlike solar or hydro. A Brazilian Master Thesis is suggesting the reading of wild AC coming off the mill to drive a SEPIC buck/boost converter via PWM and to charge batteries that way. The sampling of V and Amp is done within the sine curve with its...

Hi, Is Revolution interested in the location of the errors in the manual? If so, I can do a bit of proof reading. As a former teacher, I notice mistakes like 2**16 - 1 being listed as 65, 335 instead of 65,535, etc. There are also grammatical errors and typing mistakes. And, sometimes, it could...

Hi, Am interested in a one-wire, ground return or two-wire pump controller. Perhaps Dr-Acula can help us with the detail of his?? Pls be detailed as I do not have a black belt in electrickery!

Unless I am mistaken I do not think that the technical manuals indicate the max. mA which can be sourced/sink(ed). Thanks for the info.  

Hi, A very tall order! Anyone working on a Picaxe-driven MPPT controller for a windmill? There are several schematics out there for solar PV systems but very little for wind. Thanks. dom

Hi, Have added two 4k7 resistors in pos. R5/R6 for the i2C chip and now find that the traces are protected by gauze on the underside. Am I supposed to remove the gauze and solder below or solder on top?? Second query: Had to "lay on hands" on Picaxe to get it to make contact although...

Have bought the 28/28X/40X protoboard and this EEPROM and now need to know if I have to install two 4K7 resistors in positions R5 and R6 on the board. Manual says: " ... may need ...". I have not added anything to this board as it says: " ...add only if no pull-ups are already...