Pico in Da Vinci 1.0

[ste...@stevenbright.com]

I need some help with getting the firmware to read the correct temperature from the thermistor. I'm utilizing Repetier 0.92 and I've updated the configuration.h file with "define EXT0_TEMPSENSOR_TYPE 1", however the printer thinks that the temperature is 89 degrees C at room temperature. What am I missing?

[B3]

Steven,

What is the color of your wires for the thermistor going into Pico? Purple or black? 

I am guessing black if you are going for table #1. If so, then everything should work just fine choosing temp table #1. We have not yet used Pico with a Da Vinci, but we have used it with the Repetier Firmware. If it is a Da Vinci related issue, I am no specialist in it but you can try asking the guys here: http://www.soliforum.com/topic/7614/e3d-on-da-vinci/page/8/

as they are using Pico with Da Vinci.

Where I might be able to help...one thing you can test, if you have a multi meter, measure the resistance across the leads of the thermistor at room temp, while the therm is disconnected. It should read somewhere around 70 - 110 K (ohms)

Let me know how this goes. I'll keep up the support until we get you printing.

Thanks

Mike

The B3 Team

-print on printers-

[ste...@stevenbright.com]

Mike,

Sunday evening I ran across the following forum post which indicated that the XYZ Da Vinic 1.0 includes an additional resistor in the thermistor circuit which explains why the values did not match up with the thermistor table.

http://voltivo.com/forum/davinci-firmware/438-repetier-91-e3d-v6-extruder

One of the proposed solutions is to remove the additional resistor which leaves the same circuit as used on RAMPS boards. Since I've recently began working with Repetier and am more handy with a soldering iron, I decided to remove the resistor which appears to have resolved my issues. Upon removal of the resistor, the printer reported 22C at room temperature as expected. I've only had time to complete a small test build with PLA which came out fantastic.

Thanks for your help!

Steven