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I have been playing with the axe401 28x2 shield, I am trying to create a low power use datalogger and the 28x2 hardware interrupt is brilliant. I have been try to have the 28x2 sleep until an interrupt or the minutes (for each hour) reaches 59 minutes, the interrupt works fine, but sleep is not...

I love the AXE401 shield, the same size as the AXE110 datalogger and so much more flexible and powerful; 3V and sleep using hardware interrupts will extend battery life, it just needs a RTC (that likes 3V). I hope that I am missing something bloody obvious, but I cannot get the I2C to work on...

Is there a 'drop in' replacement for the DS1307 chip, which is more accurate, I mean, keeps better time over a range of weather conditions (temperature). I have a fountain controller that activates at 00 and 30mins (during daylight) and the DS1307 drifts a few minutes over a couple of months...

I am using an Axe110 datalogger with a 18M2. I have a simple normally open reed switch connected between power and input 2, the reed switch is connected via 300mm of insulated wire (not shielded cable). The Picaxe registers a changed input when I touch the reed switch wires, initially it was...

When I use Setfreq M2 with an 18M2 the sertxd works at 2400 and pauses are twice as long, however, when I use Setfreq M1, the sertxd works at 600 (not 1200) and instead of a 15sec pause taking 60 seconds it is taking 120 secs. Is this correct? Martin

Has the problem with the 18m2 writing to larger external memory (24LC256/512) been resolved with a firmware update yet? Martin

Which is better coding and or lower load on the picaxe to create a timing loop. A for/next or do/loop (both a similar bytes). Another appraoch could be a long pause with polled interrupt, but I was more interested in the for/next do/loop question 'for/next for w0 = 1 to 6000 'combined with...

Hi I am using pulsin on an 18x to read an x-band motion sensor (www.parallax.com), it works fine at normal clock speeds, but when I underclock the chip, the program does not run properly, that is, it constantly resets the chip. The underclocking works fine if I comment out the pulsin line, and...

I have built several passive infra-red (PIR) based Picaxe data-loggers that record the number of people walking into the detecting area, these work well, however, PIR is limited to about 8-10 metres. I would like to build a counter that covers a width of 30-50 metres without having to have a...

I am playing around with 315mHz wireless units, I am having problems with Picaxe receiving a signal via serin when not attached to the receiver, which I assume is interference. I have used both an 18x in the datalogger unit AXE110 and an 8m on a Picaxe 80 Proto board. Currently I have a 10cm...

I have a datalogger running off a 12v lead acid battery. Is there any way for the Picaxe that is monitoring battery voltage to shut the datalogger down when the voltage gets to a predetermined level (that is, before damage occurs to the battery)? The only low power idea I have had is to use a...

If I wanted to measure how much force was being used by a drill going into a piece of wood, assuming a known force on the drill (e.g., a 1 kg weight) and a known drill bit diameter, fluting, a fully charged battery, etc, would it be possible/feasible to measure the current load on the motor...

I am summarising data collected over an hour, each hour the data is written to an eeprom. To record the hour the data was collected for, I simply use the current RTC reading (converted to decimal) -1. This works fine for all hours except midnight (hour 24) where it returns 255 instead of 23. I...

User interaction for set program parameters I have searched the forum, and may be I have missed it, but what I am trying to do is have the user be able to set some parameters for the program. Currently I use the memory_full routine (as used by the wizard) to have serin wait for “G&#8221...

Ignoring all other factors that can be done to maximise battery life (e.g., underclocking). Will using 4 x AA batteries via a diode to reduce the voltage outlast 3 x AA batteries (of the same batch)? Martin

Hi I know this is probably somewhat of a naive newbie question but I am struggling with the concept and cannot find anything that seems to explain it well. How do calculated or at least estimate the amount of eeprom memory will be used when logging data? The program editor datalogger wizard...

I am using an 18x-datalogger, and have not really been able to find a way to easily stop the datalogging and download the data stored in the eeprom before the memory is 'full' (works fine once the memory is full). I presume it is because the datalogger is designed to continue logging after a...

I have spent a far amount of time reading the forum and manuals, however this is the first time I have played with more than a bit of batch file programming, and I am trying to make sure I am on the right track before I start trying the programming! I have an AXE110 data logger with RTC and...