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- SBL1360 analog input range changed
SBL1360 analog input range changed
10 years 2 months ago #29528210
by Herman
SBL1360 analog input range changed was created by Herman
I have a SBL1360.
What I see that an analog input on pin10 (ANA5) displays in Roborun not the absolute input voltage:
input >> Aln5 display
0V = 0
2.5V = 1800
5V = 3600
Another controller (MBL) displays the input voltage as absolute voltage like 5V displays 5000
Please help.
Herman
What I see that an analog input on pin10 (ANA5) displays in Roborun not the absolute input voltage:
input >> Aln5 display
0V = 0
2.5V = 1800
5V = 3600
Another controller (MBL) displays the input voltage as absolute voltage like 5V displays 5000
Please help.
Herman
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- roboteq
10 years 2 months ago #29528211
by roboteq
Replied by roboteq on topic Re:SBL1360 analog input range changed
If this is happening only to one channel and if you have double checked the wiring, then it may be a problem with the calibration values.
From the console send ~zaic
Report the values returned
From the console send ~zaic
Report the values returned
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10 years 2 months ago #29528212
by Herman
Replied by Herman on topic Re:SBL1360 analog input range changed
Wiring is ok, use same setup with MBL1650.
calibration values normal
250mV - 2500mV - 4750mV
send ~ziac from console: return 0:2:1:2:2:2:-2
Analog input 1 and 2 checked: normal behaviour
If I enable all analog inputs I see that Aln5 and Aln6 exactly display the same value with only analog input 5 connected.
Short on uC ?
Herman
calibration values normal
250mV - 2500mV - 4750mV
send ~ziac from console: return 0:2:1:2:2:2:-2
Analog input 1 and 2 checked: normal behaviour
If I enable all analog inputs I see that Aln5 and Aln6 exactly display the same value with only analog input 5 connected.
Short on uC ?
Herman
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- roboteq
10 years 2 months ago #29528213
by roboteq
Replied by roboteq on topic Re:SBL1360 analog input range changed
try connecting only analog 5. If the value is the same on analog 5 and 6, that would point to a shorting problem
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10 years 2 months ago #29528214
by Herman
Replied by Herman on topic Re:SBL1360 analog input range changed
Hi Cosma, I did (....with only analog input 5 connected)
Herman
Herman
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- roboteq
10 years 2 months ago #29528215
by roboteq
Replied by roboteq on topic Re:SBL1360 analog input range changed
Please clarify. Do you see the same problem when connecting to ain5?
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10 years 2 months ago #29528216
by Herman
Replied by Herman on topic Re:SBL1360 analog input range changed
Input impedances AIN/DIN to Ground, controller off:
input
1 53K
2 53K
3 53K
4 53K
5 36K !!
6 36K !!
input
1 53K
2 53K
3 53K
4 53K
5 36K !!
6 36K !!
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- roboteq
10 years 2 months ago #29528217
by roboteq
Replied by roboteq on topic Re:SBL1360 analog input range changed
There must be a short. Try locating it, if possible.
AIN5 goes from pin10 of the connector to R33. The other end of R33 goes to R42
AIN6 goes from pin 15 to R38. The to R43.
Send a high resolution photo of the showing the 15pin connector and the resistors that surround it.
AIN5 goes from pin10 of the connector to R33. The other end of R33 goes to R42
AIN6 goes from pin 15 to R38. The to R43.
Send a high resolution photo of the showing the 15pin connector and the resistors that surround it.
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10 years 2 months ago #29528218
by Herman
Replied by Herman on topic Re:SBL1360 analog input range changed
On my board R38 goes to R46 (not R43)
I cannot see any visible short at the top of the PCB. I measure a short between the hot sides of R46 and R42. The hot sides are the sides who are connected to R38 and R33. The other sides of R46 and R42 are GND.
Also R38/R46 and R33/R42 having a considerable distance from each other so a short there is not possible.
I see there are via\'s in the board but how can I have a look at the backside of the PCB ?
Are the inputs via the resistor divider conncted to the ARM. Maybe there is a short between the pins on the ARM or is that not possible. If you give me the pin# I can have a look.
Addition:
See possible shortage on ARM pins near R54. I cannot see it clearly with my magnifying glass. Are inputs 5/6 connected on that side near R54 ??
I cannot see any visible short at the top of the PCB. I measure a short between the hot sides of R46 and R42. The hot sides are the sides who are connected to R38 and R33. The other sides of R46 and R42 are GND.
Also R38/R46 and R33/R42 having a considerable distance from each other so a short there is not possible.
I see there are via\'s in the board but how can I have a look at the backside of the PCB ?
Are the inputs via the resistor divider conncted to the ARM. Maybe there is a short between the pins on the ARM or is that not possible. If you give me the pin# I can have a look.
Addition:
See possible shortage on ARM pins near R54. I cannot see it clearly with my magnifying glass. Are inputs 5/6 connected on that side near R54 ??
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- roboteq
10 years 2 months ago #29528219
by roboteq
Replied by roboteq on topic Re:SBL1360 analog input range changed
The mcu pins are 61 ans 52. They are near C5.
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