Hi peoples,
I started building my very first Prusa Mendel I2 that i had purchased from
amazon [www.amazon.co.uk]
(3rd party dealer) at the start of December. Give or take 3 -4 days later (after work ) I've managed to almost complete it.
HOWEVER, I have spent the past 10 days scratching my head regarding an issue i have with the heat bed. As it describes in the link the heatbed is a PCB MK2a.
Im running ramps 1.4 (red ultimachine??) with a Arduino MEGA 2560 and using the sprinter firmware for pronterface.
I have followed many guides in order to get my prusa mendel i2 completly built as only half of them make any seance.
Anyway the problem i have is that the ramps is not sending the signal to turn on the heat bed (i believe the reason is because that the thermistor is showing 357 degrees Celsius). THAT SAID even the extruder is showing funny temps in pronter face BUT IS still turning on. (151 Celsius - extruder )
The following things i have already checked and double checked are:
Checked power supply from power supply to ramps at 12vdc on both inputs
Checked Resistance of thermistor at 100k
Checked resistance of Heatbed (Is ok but forgotten what it was)
Checked wiring to what ive seen on the guide (http://reprap.org/mediawiki/images/e/e3/Rampswire13.svg)
I have even tried removing the heatbed wires from the output of the ramps (D8) and moved it to D10 (Extruder output) and turned the heatbed on by pressing the extruder heating button in pronterface and it DOES turn on.
So I know the heatbed is working, I know the PSU is capable of the supply for both the extruder and the heatbed 12.03v DC Upto 29 Amps.
So back to pronterface and the software side of things -------
As i said earlier pronterface is receiving funny signals from the thermistors (I have attached a picture) But here is the catch !!! I get these reading with or WITHOUT thermistors pluged in or not
Which points the finger straight at the sprinter software. WHICH i have also had a little play around with.
So when it comes to programming im no genius but i do know my way around a computer. What i tried first was adjusting the config file to a ramps 1.2, Uploaded it, HEATBED WORKED, But nothing else did (properly including the thermistor readings)
I decided to then do a little more research and have a look through the pins page on arduino, I even managed to copy the xyz axis settings of the standard sprinter firmware into the ramps 1.2 definition so that i could use same settings as 1.3 on pronterface.
Gave in with this idea pretty quick as it was still only intermittently working and after all it is a ramps 1.4!! so i went back to the pins page and played around with the following lines numbers:
#define TEMP_0_PIN 2 // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
#define TEMP_1_PIN 1 // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
#endif
This seemed to have played around a little with the thermistor readings on pronterface, However as i do not understand programming i am totally oblivious to what i am actually changing .
PLEASE PLEASE PLEASE PLEASE HELP!!!!!!!
I have also tried the marlin software but all the axis are not set up like the sprinters and yet again the heatbed still doesn't work.
Many Thanks
George
I started building my very first Prusa Mendel I2 that i had purchased from
amazon [www.amazon.co.uk]
(3rd party dealer) at the start of December. Give or take 3 -4 days later (after work ) I've managed to almost complete it.
HOWEVER, I have spent the past 10 days scratching my head regarding an issue i have with the heat bed. As it describes in the link the heatbed is a PCB MK2a.
Im running ramps 1.4 (red ultimachine??) with a Arduino MEGA 2560 and using the sprinter firmware for pronterface.
I have followed many guides in order to get my prusa mendel i2 completly built as only half of them make any seance.
Anyway the problem i have is that the ramps is not sending the signal to turn on the heat bed (i believe the reason is because that the thermistor is showing 357 degrees Celsius). THAT SAID even the extruder is showing funny temps in pronter face BUT IS still turning on. (151 Celsius - extruder )
The following things i have already checked and double checked are:
Checked power supply from power supply to ramps at 12vdc on both inputs
Checked Resistance of thermistor at 100k
Checked resistance of Heatbed (Is ok but forgotten what it was)
Checked wiring to what ive seen on the guide (http://reprap.org/mediawiki/images/e/e3/Rampswire13.svg)
I have even tried removing the heatbed wires from the output of the ramps (D8) and moved it to D10 (Extruder output) and turned the heatbed on by pressing the extruder heating button in pronterface and it DOES turn on.
So I know the heatbed is working, I know the PSU is capable of the supply for both the extruder and the heatbed 12.03v DC Upto 29 Amps.
So back to pronterface and the software side of things -------
As i said earlier pronterface is receiving funny signals from the thermistors (I have attached a picture) But here is the catch !!! I get these reading with or WITHOUT thermistors pluged in or not
Which points the finger straight at the sprinter software. WHICH i have also had a little play around with.
So when it comes to programming im no genius but i do know my way around a computer. What i tried first was adjusting the config file to a ramps 1.2, Uploaded it, HEATBED WORKED, But nothing else did (properly including the thermistor readings)
I decided to then do a little more research and have a look through the pins page on arduino, I even managed to copy the xyz axis settings of the standard sprinter firmware into the ramps 1.2 definition so that i could use same settings as 1.3 on pronterface.
Gave in with this idea pretty quick as it was still only intermittently working and after all it is a ramps 1.4!! so i went back to the pins page and played around with the following lines numbers:
#define TEMP_0_PIN 2 // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
#define TEMP_1_PIN 1 // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
#endif
This seemed to have played around a little with the thermistor readings on pronterface, However as i do not understand programming i am totally oblivious to what i am actually changing .
PLEASE PLEASE PLEASE PLEASE HELP!!!!!!!
I have also tried the marlin software but all the axis are not set up like the sprinters and yet again the heatbed still doesn't work.
Many Thanks
George