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I have a setup where I am using an interrupt to signal a fault, (i.e. if the pin goes low then interrupt because the other part of the circuit is indicating a fault). When the other part of the circuit signals a fault I need to do a number of things to reset it which includes do-loops, gosubs...

I have a DS1307 where I want to set the time using the writei2c command and I cannot get my head around the conversions needed. I have an OLED display with buttons so I can set the time manually. The format is hh:mm:ss. (b0,b1,b2,b3,b4,b5). Each digit of the time is stored in the bytes b0 to...

I am using some 28X2 and 40x2 Picaxes where serial communication is needed. Can someone just confirm for me that any of the ports (port a, port b...etc) can be used with the serin and serout commands? I can't find a direct answer to this but I think they can. I don't have the chips yet so I...

I have been trying to come up with a driver circuit and have attached an image showing what I am thinking. I'm looking at using the L297 and some TIP122 transistors. The pins not connected on the image will be connected to the Picaxe so the Picaxe will control the L297 and it will do the phase...

Thanks for replying. I eventually got the datasheet for the motor and have attached it. Is this motor suitable for a Picaxe to control, if so could someone advise me on what I might need to do to get it working? (i.e. the hardware needed after the Picaxe such as a driver) Thanks, ruairihev

Looking for some advice on driving a stepper motor using a Picaxe to provide the drive signal. Most of the searches I've done are related to low current stepper driving, I have a motor that has continuous current of 3A and peaks of 5A. The motor can be purchased with a controller but it costs...

I am having a problem with a PI (Proportional Integral) controller for a small wind turbine pitch control mechanism that I am playing around with. The problem is that I don't know how to write the code to get the PI controller working. I have the understanding of what I am trying to do but I...

I have pin 21 (output 0) on a 28x1 connected to pin 2 (serin) pin on a 08m2 with no series resistor between them. There is a 10k pulldown resistor. I want to use these pins for serial communication. As I can't use an interrupt on the serin pin of the 08m2 to detect a pulsout from the 28x1, I was...

I'm using a 08M2 to read serial data from a device. The device output is of the form $WIMWV,12,34,56 When I use this code: serin 2,N4800_4,b0,b1,b2,b3,b4,b5,b6,b7,b8 I get the values b0=$, b1=W, b2=I.....etc which shows that the everything is connected and working When I use this code I get...

I hadn't decided on any values, it's whether this type of circuit will do the job or not or can it be done with a simpler circuit. Wondering really if anyone has done something like this before and could help me out with it. I have included some resistor values in the new schematic which I will...

I'm posting a schematic of a battery charging and load sharing system that I am trying to make. What I want to do is have the load run from the mains but if the mains should fail then the battery will take over. The battery is a 24V Ni-Mh 1700mAh. I have a transformer that steps the mains down...

Hi, I am looking into geting a device for monitoring a wind turbine that is in a field in the middle of nowhere. I have found such a device that uses GPRS for live monitoring and sends the data to a webpage where it can be viewed, it costs nearly €500 so I want to see if something with a Picaxe...

Hi, I am using a 28x1 to read NMEA data from a device. I can receive the data I want using the following code: serin 7,N4800,("$WIMWV,"),b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12 But I now need to use the variables b1 to b12 for other parts of the program and want to use hserin to read my serial...

Hi, I have a non standard protocol that I want to read using the hserin pin and command on a 28x1. I know the protocol but not exactly sure how to caputure the data into the Picaxe. It is a 37 bit string with a duration of 1.2mS. bits 1-5 = Start: 11011 bits 6-9 = Direction : bit 6 LSB, bit 9...

Hi, I want to connect an anemometer and windvane to a Picaxe so that I can measure wind speed and wind direction. I have found this product on the internet and want to make sure that it is suitable for use with a Picaxe before I buy it as it is quite expensive...

Hi, I have a 28x1 circuit that I use for monitoring the voltage of a 24V battery, I have included a circuit diagram. The voltage readings are fine until I draw power using the inverter, when this happens the voltage readings fluctuate wildly. Before drawing power the voltage could be sitting at...

Hi, I am trying to use a push button to select different menus on a LCD. I have included a snippet of my code. I can display the data that I want on the LCD and I can also move between the menus using the push button. The problem I have is that the display on the LCD is flickering. It's not a...

I want measure the Amp hours remaining in my battery bank so that I don't discharge it less than 60% of its capacity. The problem is that in order to get a good figure as to how much is left in the battery I need to do some maths. The formula is T=R(C/R)^n/I^n. n is equal to 1.3. Is there any...

I have a 28x1 and want to measure the voltage drop across a 50A 75mV shunt so that I can measure current flowing through the shunt. Currents up to 40Amp will flow through the shunt. The shunt resistance is 0.075/50 = 0.0015. I want to measure in 1A steps so 1A flowing through the shunt equals a...

I am using a 28x1 to display voltage and current readings on an LCD. I have connected the circuit using the schematic on hippys page http://www.hippy.freeserve.co.uk/picaxelc.htm#Output_Pin_Definition I also just cut and pasted his code for the hello world program and got it to work (I had to...