Recent content by evans_us

Hi All I am having trouble sending data using an HC05 Bluetooth device. I wrote a program that uses hsersetup to use both 9600 and 38400 baud (since I have a couple of the HC05s set at these baud rates). I see the transmitted bytes on the terminal when I am connected through a serial cable to...

Hi All I have a general question about the serial output voltage. If my picaxe (an 08M2) is fed by 3.3V VCC then is the serial output at 3.3V or at 5V? I am trying to determine if I need a voltage divider on my Tx line to interface with a bluetooth module that takes 3.3V signals. If I need to...

Hi all I have always used a USB serial converter to commnicate with my circuits. However, many of the circuits I have been using lately are very small - using the 08M (and moving to 08M2 very soon :)). The problem is that the power supply (even a wall wart) and serial (DB9) converter make the...

Dear All I have migrated from a 28x2 down to the 08M for a project. I have read that you can use serout (leg7) as an output as well as for the Tx line but that this will result in an LED attached to the output "flickering" when the Tx line is being used for program loading. I have all the other...

Hi All I have a thermostat chip that provides an increasingly negative voltage as temperature increases and I would like to be able to monitor this voltage using READADC (or READADC10) on a picaxe08M. The question is how do I measure negative voltage on the Picaxe 08M? The chip is a Rohm...

Hi All I am using the 28x2 to communicate with an external chip that specifies maximum SPI comm rate at 3MHz. I am using the 28x2 at its preset 8MHz. My question is whether I need to throttle back on the frequency of the 28x2 and, if so can I do this right before communicating with the external...

Hi All I am looking for a navigation switch with a button like a D-pad on a game controller. It should have 2 axes with a spst switch in each of the 4 directions. Button shoulkd be ~1" diameter. I have been through Digikey etc but only find small buttons. These would be too fiddly in the...

Hi All I am trying to create a DDS with an AD9834 chip but have 2 questions before I start the project. Has anyone written code for this chip with a picaxe? Specifically, I want to know how I send the values for the frequency to this chip using SPI since it takes a 32 bit value. Also can I put...

Hi Anyone know where I can get an off-the-shelf membrane switch. I need 4 buttons (Up/down/enter/reset). If it helps these will be going to the right of a 4x20 LCD display. Thanks for suggestions in advance Evans_us

Hi I would like to be able to assign an input (leg 14 on a 28x1) to a variable and call this in code rather than refer to the pin each time. This way when I change the circuit I only need change the assignment at the header of my code. Currently I have let dirsC=%11110000 'make sure the pins...

Hi, after getting my code for the AXE033 LCD display to work in the simulator (great invention) I received my AXE033 kits. After putting one of these kits together and plugging into my picaxe28x1 I do not get any messages on the screen - even if I short the clock pins as suggested. There is no...

Hi I have been testing code to run on an LCD (AXE033; 16 x2) I have several "user values" that can increment (0-999) when a button is pressed and the program asks for each of the 4 values which are stored in variables (words). I would like to display all these values on the LCD screen and know...

Does anybody know how to send 16 bits using SPIout on 28x1? It appears from the manual that max is 8 bits but no example or instructions for additional bits. Any example code would be welcome. Can you use any of the PortB pins? or do you have to use the hardware pins? Thanks Much for any help.