Servo Tester - Read Receiver Pulses with Arduino
Servo Tester - Read Receiver Pulses with Arduino
Hi guys..
I've built my arduino and a kind of LCD shield for it. It's a 16x2 LCD.
I will use it to learn but would also like to be able to make something useful with it at the same time.
Something that after testing I could obviously buy all the components, build it, and put it in a case.
I thought of a Servo tester, servo cycler, that could also read the pulses from a couple of receiver channels at the same time and display the data on the LCD. It could also read the pack voltage.
I've searched the web and found a couple of projects, but they were not made with arduino, or wouldn't do all I wanted..
If you know of a project like this one please point me to it.. Thank you.. I think this is a nice useful RC project to build..
João
I've built my arduino and a kind of LCD shield for it. It's a 16x2 LCD.
I will use it to learn but would also like to be able to make something useful with it at the same time.
Something that after testing I could obviously buy all the components, build it, and put it in a case.
I thought of a Servo tester, servo cycler, that could also read the pulses from a couple of receiver channels at the same time and display the data on the LCD. It could also read the pack voltage.
I've searched the web and found a couple of projects, but they were not made with arduino, or wouldn't do all I wanted..
If you know of a project like this one please point me to it.. Thank you.. I think this is a nice useful RC project to build..
João
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Re: Servo Tester - Read Receiver Pulses with Arduino
Ok I found this project here.. It looks good. It has a lot of options..
My question is:
would it be possible to adapt this to arduino? or even use an atmega 8 instead? (only because I have a couple laying around )
http://www.ejberg.dk/servotst2/index.html
Thanks,
João
My question is:
would it be possible to adapt this to arduino? or even use an atmega 8 instead? (only because I have a couple laying around )
http://www.ejberg.dk/servotst2/index.html
Thanks,
João
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Re: Servo Tester - Read Receiver Pulses with Arduino
While not exactly what you are looking for, this might help.
A code fragment to read a PPM sum signal using interrupts. I use it in my IrModule.
http://diydrones.com/profiles/blogs/705 ... Post:39393
A code fragment to read a PPM sum signal using interrupts. I use it in my IrModule.
http://diydrones.com/profiles/blogs/705 ... Post:39393
Re: Servo Tester - Read Receiver Pulses with Arduino
His source file throws up a 403 forbidden. The license is restricted allso. The schematic showed an avr @ 10mhz. You could probably add something to your boards.txt in arduino to be able to utilize the ide with that avr/clock speed. Not sure how usable the assembly based source would be within the arduino ide. Also saw something about the serial interfa e not being complete. Maybe it was complete on v1. In spite of all this it is worth pursuing. I'd shoot the designer an email.
Re: Servo Tester - Read Receiver Pulses with Arduino
I could download the source, no problem. here it is..
It would be nice if this could be ported to the arduino.. Also could this be adapted to run at 16Mhz, which is the arduino speed?
Sorry, I don't understand much about this.. still on the blinking a LED stage.. And still having problems with it
João
It would be nice if this could be ported to the arduino.. Also could this be adapted to run at 16Mhz, which is the arduino speed?
Sorry, I don't understand much about this.. still on the blinking a LED stage.. And still having problems with it
João
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Re: Servo Tester - Read Receiver Pulses with Arduino
Hmm. It failed at work with tablet thru verizon. I ssh'ed home and wgetted from there. Still no go. Maybe I copied the url wrong ?
Anyway
I think arduino can be manipulated to compile assembly, but it's not very friendly to modify. It's beyond my comprehension.
Anyway
I think arduino can be manipulated to compile assembly, but it's not very friendly to modify. It's beyond my comprehension.
Re: Servo Tester - Read Receiver Pulses with Arduino
I sent him a email.. let's see if he answers..
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Re: Servo Tester - Read Receiver Pulses with Arduino
At least it assemles without problem when loaded into AVRStudio
Reinhard
Reinhard
Re: Servo Tester - Read Receiver Pulses with Arduino
So, does that mean I can use any other atmega?
Thanks
Thanks
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Re: Servo Tester - Read Receiver Pulses with Arduino
Dont know for sure but here would be some things to take into consideration.
This would be a good project to learn some assembly
I see where he calls out a 10 mhz crystal
several timers. I know when trying to port a simple library to an M8 the timers had different cababilities and were defined differently
and a lot of interrupt routines
This would be a good project to learn some assembly
I see where he calls out a 10 mhz crystal
Code: Select all
lcd.inc: nop ;500 ns delay (@ 10 MHz xtal)
lcd.inc: nop ;500 ns delay (@ 10 MHz xtal)
util.inc: push w1 ;Only valid for 10 MHz xtal
and a lot of interrupt routines
Code: Select all
;**** Interrupt routines
EXT_INT0: ; IRQ0
call RotaryChange_int
reti
EXT_INT1: ; IRQ1
call RotaryChange_int
reti
TIM2_COMP: ; Timer2 Output Compare Match
call Timer_CompareMatch_int
reti
TIM1_CAPT: ; Timer1 Input Capture Handler
call Pulse_InputCapture_int
reti
TIM1_OVF: ; Timer1 Overflow Handler
call Pulse_Overflow_int
reti
ADC_COMP: ; A/D Converter Conversion Complete
call ADC_Complete_int
reti
Re: Servo Tester - Read Receiver Pulses with Arduino
I tried with ATMega328 but it will probably work with other types also. (ATMega48, 88, 168, 328 share the same manual, so should be no big differenc besides flash and eeprom size. But IIRC there are at least, differences in the fuse settings.)
Just tried for ATMega8 and it also assembles without error. May be, but don't know, if some registers or functions are different, but, I simply would try it.
Just saw last post, yes timers may be different
Reinhard
Just tried for ATMega8 and it also assembles without error. May be, but don't know, if some registers or functions are different, but, I simply would try it.
Just saw last post, yes timers may be different
Reinhard
Re: Servo Tester - Read Receiver Pulses with Arduino
but since it compiled ( I'm assuming aseembles =compiles) he may be in good shape. The project I was working on wouldnt even compile due to different definitions of the timer registers. There is still the 10mhz issue though
Re: Servo Tester - Read Receiver Pulses with Arduino
could we change it to 12 or even 16Mhz? Sorry guys this was the only project I found that would do all I wanted. I think he only uses 10Mhz because the CPU can handle it at lower voltage.
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Re: Servo Tester - Read Receiver Pulses with Arduino
I got my Arduino Uno to read pulses from my RX channel 8 using pulseIn() and detct the difference between on/off on my gear switch. Not sure what that means in terms of accuracy but given the number of Arduino based flight controllers, I suspect it is a good start
Re: Servo Tester - Read Receiver Pulses with Arduino
my guess is that it would work with a different crystal but that the timers may have to be reconfigured. being that it is written in assembly, that's all I can say. Maybe you could get a 10mhz crystal and put that in your arduino ??
Re: Servo Tester - Read Receiver Pulses with Arduino
if I have to get a XTAL then, or I could just as well get another atmega.. Or if it works with the atmega8 just get the XTAL.
This is a project to install inside a nice case and use it.. We could cycle new servos with it..
I think he mentions something about waiting for the atmega168 that was coming out at the time..
João
This is a project to install inside a nice case and use it.. We could cycle new servos with it..
I think he mentions something about waiting for the atmega168 that was coming out at the time..
João
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Re: Servo Tester - Read Receiver Pulses with Arduino
Most of the posts and sites I've read about this say to not use "pulsein" because it is not accurate.hart wrote:I got my Arduino Uno to read pulses from my RX channel 8 using pulseIn() and detct the difference between on/off on my gear switch. Not sure what that means in terms of accuracy but given the number of Arduino based flight controllers, I suspect it is a good start
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Re: Servo Tester - Read Receiver Pulses with Arduino
What frequency crystal is on your board? The 'M328 will go up to 20 MHz, and there is an option to divide the clock by 2 to give 10 MHz.
Mike.
Mike.
erskyTx/er9x developer
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Re: Servo Tester - Read Receiver Pulses with Arduino
I have a 16Mhz Crystal.. I built it following the arduino UNO schematic.. I just didn't build the USB to serial converter as I have an FTDI.
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Re: Servo Tester - Read Receiver Pulses with Arduino
but that is not a problem.. I've decided now that I will build it to be permanent.. I just thought I could test it before with the arduino..
João
João
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Re: Servo Tester - Read Receiver Pulses with Arduino
I built something simpler 10 years ago using a Microchip PIC and 2 7-segment displays to show 0-99. The main feature I wanted was a pot so I could set the servo pulse and use this to set up servos without needing the Tx and Rx connected. It did also measure the servo pulse from a receiver. All written in PIC assembly language!
I recommend including a POT to allow use to set up servos, it is very useful for setting the centre and throws mechanically.
Mike.
I recommend including a POT to allow use to set up servos, it is very useful for setting the centre and throws mechanically.
Mike.
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Re: Servo Tester - Read Receiver Pulses with Arduino
Ah, the good times of PIC assembly, I've gone through that too! Have to say their instruction set was very convenient to use!
But the first pulse width display I built used 4 LED 7-segment displays... entirely driven by standard discrete logic chips
But the first pulse width display I built used 4 LED 7-segment displays... entirely driven by standard discrete logic chips
Re: Servo Tester - Read Receiver Pulses with Arduino
I don't know how much help this will be. I am using an interrupt in an Attiny25 to read a receiver ppm input.
The external interrupt (int0 pin) is initially set to trigger on a rising edge. The first time through starts the timer, and switches the interrupt to the falling edge. When the falling edge comes, the interrupt stops the clock, checks if it was a valid pulse, if so copies the value to the ppmin variable. And finally resets the timer, and interrupt edge. Using the internal oscillator I have a resolution of 16us. Of course my timer is only 8 bits.
-Gohst
Doing something similar with an Arduino you can get 62.5 nS resolution. Just use 16-bit timer1, and set it's prescaler to 1.
Code: Select all
// external interrupt on the INT0 pin
ISR(INT0_vect) {
if(PINB & (1<<ppmInPin)) { // pin is high, start of ppm pulse
TCCR1 = 0x08; // start timer1; CK/128, timer input clock
MCUCR = 0x02; // interrupt on falling edge
} else {
// it is now the end of the pulse
TCCR1 = 0; // stop the clock
if(TCNT1 > 50) { // check if a real pulse, not a transient
if(!(TIFR & (1<<TOV1))) { // make sure the timer didn't overflow
ppmin = TCNT1; // record the new value
ppmLastUpdate = millis();
neverPPM = false;
} else {
TIFR |= (1<<TOV1); // clear the flag if set
}
}
TCNT1 = 0; // clear counter
GTCCR = 0x01; // clear prescaler
MCUCR = 0x03; // interrupt on rising edge
}
}
-Gohst
Doing something similar with an Arduino you can get 62.5 nS resolution. Just use 16-bit timer1, and set it's prescaler to 1.
Re: Servo Tester - Read Receiver Pulses with Arduino
Ok, guys, thank you very much for all your inputs..
I just went shopping and didn't see the latest posts.. was very busy buying chips.. and othe relectronic stuff that I need.
Didin't buy the encoder cos at reichelt they wanted about €18 for one without push button. so, no.. then I thought of building the servo tester 1, as I don't need the tachometer, and battery voltage/current features.. What I need, the version 1 can do which is, read receiver pulses with an without passing the signal to the servo, sweep (cycle) the servo. these 2 features were the main reason I wanted to build it anyway..
But as we never know the future, I bought an Atmega 16 also
also got some 10Mhz Xtal
Bought an ATtiny 2313 for the servo tester 1 and a 16x1 LCD but I have some 16x2 LCDs also
Got a couple ATtiny 85 because they look cute No, but they are excellent for little projects, and they are cheap.. I can think of a few RC applications for them. Maybe future projects?? Glow plug drivers, switches, etc..
Gohst, you are reading the receiver channels with the Tiny and then sending them to the computer, right?..
It's a shame that I can't program yet.. but I learn fast. I'm on my second blinking LED at the moment
I would like to build something like in that servo tester project, with an LCD. forget the encoder as it gets too expensive
Now shall we stay with it or maybe develop something 9x gang style?
Thanks
João
I just went shopping and didn't see the latest posts.. was very busy buying chips.. and othe relectronic stuff that I need.
Didin't buy the encoder cos at reichelt they wanted about €18 for one without push button. so, no.. then I thought of building the servo tester 1, as I don't need the tachometer, and battery voltage/current features.. What I need, the version 1 can do which is, read receiver pulses with an without passing the signal to the servo, sweep (cycle) the servo. these 2 features were the main reason I wanted to build it anyway..
But as we never know the future, I bought an Atmega 16 also
also got some 10Mhz Xtal
Bought an ATtiny 2313 for the servo tester 1 and a 16x1 LCD but I have some 16x2 LCDs also
Got a couple ATtiny 85 because they look cute No, but they are excellent for little projects, and they are cheap.. I can think of a few RC applications for them. Maybe future projects?? Glow plug drivers, switches, etc..
Gohst, you are reading the receiver channels with the Tiny and then sending them to the computer, right?..
It's a shame that I can't program yet.. but I learn fast. I'm on my second blinking LED at the moment
I would like to build something like in that servo tester project, with an LCD. forget the encoder as it gets too expensive
Now shall we stay with it or maybe develop something 9x gang style?
Thanks
João
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Re: Servo Tester - Read Receiver Pulses with Arduino
Actually that is part of the program for my helicopter lights. It has 3 modes, that is why I read the receiver channel. Off, scale lights only, and full night illumination. It is a scale Hughes 500. So no output to the computer. Also it will detect a signal loss (no ppm signal) and flash all of the lights.
-Gohst
-Gohst
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Re: Servo Tester - Read Receiver Pulses with Arduino
erskyTx/er9x developer
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Re: Servo Tester - Read Receiver Pulses with Arduino
Very nice project Mike.. Hmm, that gives me some ideas..MikeB wrote:Link to another of my past projects: http://www.giantshark.co.uk/forum/viewt ... lit=#p6970.
Mike.
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Re: Servo Tester - Read Receiver Pulses with Arduino
It looks like the construction ot that kit has some quality.. And not bad for the price.. not at all..gohsthb wrote:Actually that is part of the program for my helicopter lights. It has 3 modes, that is why I read the receiver channel. Off, scale lights only, and full night illumination. It is a scale Hughes 500. So no output to the computer. Also it will detect a signal loss (no ppm signal) and flash all of the lights.
-Gohst
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Re: Servo Tester - Read Receiver Pulses with Arduino
João, with the servo tester idea - is the pulseIn Arduino method any use to you? I was able to detect values 1400-1900 on my gear channel, for example, using the attiny45 - not sure I understand the complexity of this yet
Re: Servo Tester - Read Receiver Pulses with Arduino
I will try to build the servo tester version 1 from the link I posted above.. the problem is that the code is in assembler, so not of much use for me I guess.. I also have all the parts now for the version 2 but the price reichelt wanted for the encoder was prohibitive..
João
It seems that for some reason the pulsein is not very precise? and if you try to read more than 2 channels it won't work well??
At least that's what I've read..
João
João
It seems that for some reason the pulsein is not very precise? and if you try to read more than 2 channels it won't work well??
At least that's what I've read..
João
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