Add code to support sensors that allow the IR output to be modulated, to
reduce the sensitivity to ambient IR. Use M558 P2 command to enable
sensor modulation. Also changed the sensor reading averaging code to
give more consistent z-height seeking.
This change approximately doubles the speed of SD-card uploading via USB
to 2.2Mbyte/sec on the test system, provided that Pronterface has been
patched to not wait for an acknowledgement after sending each line of
g-code.
Fixed printing over USB and via HTTP so that it uses the same lookahead
mechanism as for printing from SD provided the data arrives fast enough.
Added an incoming buffer for data arriving from USB. NOTE: Pronterface
needs to be patched to send the data fast enough for this to work well.
Also changed signatures of some member functions to be const-correct
Improved network error recovery so that it it possible to reconnect
after some types of network error have occurred
Corrected calculation of temperatures to give more accurate results
towards the limits of the ADC range
file names into a structure created in RepRap that was too short for them. Result - buffer overflow misery. For the moment I've commented out the bit of code in ff.c that handles long names (look for the string ******), but this needs to be tracked down and dealt with properly.
1. Z home now moves home, rather than just setting the coordinate.
2. Wait for temps implemented.
Also the JSON requests for the g code filelist has been temporarily commented
out in reprap.htm. It was causing the firmware to hang sometimes. To be investigated.
Machine now prints nicely...
track up the low-precision slope of the IR probe before measuring down
the high-precision slope near 0 mm. But this means that the probe has to
be set only a fraction of a mm higher than the nozzle itself. Also (at
the moment for safety) the code thinks Z = 0 occurs when it is actually
0.2mm. This is easy to fix when the rest is reliable.
is A0 on the Arduino. The signal seems quite noisy. I have put a 10uF
capacitor across its supply. Maybe add an 0.1uF across its signal?
Two values need to be set in Platform.h:
If v is the value from the A->D on A0, then:
z = v*Z_PROBE_GRADIENT + Z_PROBE_CONSTANT (mm)
Z_PROBE_GRADIENT is dependent on the IR proximity device (though they may
be consistent enough all to have the same value) and Z_PROBE_CONSTANT depends
on how high it is mounted relative to the nozzle.
To generate these values, uncomment the bits of code in and around Platform::Spin()
zero the Z axis by eye, run the program, and raise Z by 0.1mm increments. Put
the raw A->D values in the spreadsheet in the Data directory, and it will
give you the values of Z_PROBE_GRADIENT and Z_PROBE_CONSTANT.
