AXE033 I2C Controller/Clock Board Circuit Diagram

[hamtech]

I have a project (DS1307 Clock/Temp Sensor/Humidity Sensor which requires a 4 line LCD and I wish to use I2C comms so means using an AXE033 . I am unable to buy either the clock/controller Board by itself (to use with my own LCDs) or with a 4 line display from the Picaxe shop. When I telephoned them I was told that I could get the circuit for the controller of AXE033 off the website and all I needed to buy was an AXE033-IC (replacement IC) to build my own.

When I looked on the website there is no circuit for the AXE033 only the aXE133 serial addon board. The chips have arrived and they are not as I first thought based on 18M2 but rather they are PIC 16F819 ics.
I contacted Tech Support who are unable/unwilling to give me a copy of the circuit but suggested I ask here.

As I previously built up an Axe033 I have tried to trace out the circuit of the LCD clock/controller. See attached View attachment AXE033-IC.pdf


Has anyone traced the circuit of the axe033 who could check my attempt , as I don't want to blow up another of the PIC16f819s I bought from Rev Ed earlier in the week (nearly £5.00. each)


If you have the circuit of the axe033 I should be grateful for either a copy or confirmation mine agrees with yours.


Regards

Hamtech

 

[nick12ab]

Yes, al the connections on your diagram are correct.

The CLK and OUT header connections are missing from the diagram though they're generally not needed. CLK appears to use its internal pull-up so will be fine if left unconnected.

AXE033 Serial LCD IC pinout

 

[hamtech]

Yes, al the connections on your diagram are correct.

The CLK and OUT header connections are missing from the diagram though they're generally not needed. CLK appears to use its internal pull-up so will be fine if left unconnected.

AXE033 Serial LCD IC pinout

Nick, many thanks for your reply, i will have a look at the clk and out connections in case. they need a pull up/ down resistor. as you say i am not sure they are reqired. One of the key things is get the chip operating in I2c mode which on the original is done by making link 1.

Regards hamtech

 

[hamtech]

Hi Nick,

Added a resistor pull up for the CLK pin to operate in standard mode. Now works perfectly, both serial and I2C modes..

I will amend the drawing and post it on here for future reference. It does not of course include the clock element..


Thanks again for your help.

Hamtech

 

[hamtech]

Here is the circuit (working) of the axe033 minus the clock element. Can be used to make your own interface board for the axe033-IC replacement.