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Hi again Thank you for your earlier response on this topic. It helped me to understand that my units where broken. I have now finally got the 202EB to function using PWM. I now want to try to use it by reading the analog signals. As I understand it is possible to have the analog signals from Xfilt and Yfilt. I am a little afraid of doing this, because I have burned to Rotomotion 2Dof Units and a 202EB, so I hope somone can help me out a little bit. So far I have welded in place a 124K Resistor and I can see from the Analog's schematic that I can weld in two capacitors. I have two capacitors 0.47uF that I can put in. My question is which physically pins from the 202EB do I now connect to my BX24. Do I weld a wire on to the new capacitor and in that case which pin, or will I by adding these capacitors get analog signals from Pin D and C ?

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Hi kjellosan, Glad to hear that you got the 202EB to BX-24 working in PWM mode. The datasheet states "An analog voltage can be obtained either by buffering the signal from the Xfilt and Yfilt pin, OR by passing the duty cycle signal through an RC filter to reconstruct the dc value." In both cases, the 202EB should have a 0.47uF and 100ohm resistor for decoupling (see Power Supply Decoupling, page 8), a 124k resistor soldered in to Rset position to set approx. T2 period of 1 millisecond for the duty cycle, a 0.47uF capacitor as Cx soldered into location C2 and a 0.47uF capacitor as Cy soldered into location C3 to set approx. 10Hz bandwidth. In the first case, you would have to add 2 suitable "analog buffers". The Xraw analog voltage present at the node of the C2 capacitor and the 202 pin would go to the input of one of your buffer circuits. The output of this buffer circuit, Xbuf analog voltage would go to the analog voltage in pin of the BX-24(read as analog). The Yraw analog voltage present at the node of the C3 capacitor and the 202 pin would go to the input of the other buffer circuit. The output of that buffer circuit, Ybuf analog voltage would go to another analog voltage in pin of the BX-24 (read as analog). The "analog voltage buffers" must have very high input resistance so as to not affect the capacitor voltage. It's possible for Op Amps to be wired as buffers. In the second case, the inputs of the RC filters you would add, would be connected to the digital PWM outputs, the D terminal for the X and the C terminal for the Y. The analog output voltages of the RC filters would go to the analog input pins of the BX-24 and be read as analog voltages. In searching documents over the last 4 years, I can find no one who has done either method successfully. There are examples of other versions of devices that have direct "Analog Outputs", that have been done. Best Regards, Eric ----- Original Message ----- From: kjellosan To: Sent: Monday, January 10, 2005 6:38 AM Subject: [BasicX] BX24 & ADXL202EB analog reading Hi again Thank you for your earlier response on this topic. It helped me to understand that my units where broken. I have now finally got the 202EB to function using PWM. I now want to try to use it by reading the analog signals. As I understand it is possible to have the analog signals from Xfilt and Yfilt. I am a little afraid of doing this, because I have burned to Rotomotion 2Dof Units and a 202EB, so I hope somone can help me out a little bit. So far I have welded in place a 124K Resistor and I can see from the Analog's schematic that I can weld in two capacitors. I have two capacitors 0.47uF that I can put in. My question is which physically pins from the 202EB do I now connect to my BX24. Do I weld a wire on to the new capacitor and in that case which pin, or will I by adding these capacitors get analog signals from Pin D and C ? [Non-text portions of this message have been removed]

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Hi Eric Thank you for your detailed answer, it cleared things up a bit for me. I feel that trying this out is difficult and risky in relation to my previous record on this device. I stick with the PWM modus, and see what I can get out of that. Besides I do soldering, not weldering on my boards. It's good that have skilled people to ask. Kjellosan --- In , "eserdahl@" <eserdahl@p...> wrote: > Hi kjellosan, > > Glad to hear that you got the 202EB to BX-24 working in PWM mode. > > The datasheet states "An analog voltage can be obtained either by buffering the signal from > the Xfilt and Yfilt pin, OR by passing the duty cycle signal through an RC filter to reconstruct > the dc value." > > In both cases, the 202EB should have a 0.47uF and 100ohm resistor for decoupling > (see Power Supply Decoupling, page 8), a 124k resistor soldered in to Rset position to set > approx. T2 period of 1 millisecond for the duty cycle, a 0.47uF capacitor as Cx soldered into > location C2 and a 0.47uF capacitor as Cy soldered into location C3 to set approx. 10Hz bandwidth. > > In the first case, you would have to add 2 suitable "analog buffers". The Xraw analog voltage present > at the node of the C2 capacitor and the 202 pin would go to the input of one of your buffer circuits. The output > of this buffer circuit, Xbuf analog voltage would go to the analog voltage in pin of the BX-24(read as analog). > The Yraw analog voltage present at the node of the C3 capacitor and the 202 pin would go to the input > of the other buffer circuit. The output of that buffer circuit, Ybuf analog voltage would go to another analog > voltage in pin of the BX-24 (read as analog). The "analog voltage buffers" must have very high input > resistance so as to not affect the capacitor voltage. It's possible for Op Amps to be wired as buffers. > > In the second case, the inputs of the RC filters you would add, would be connected to the digital PWM > outputs, the D terminal for the X and the C terminal for the Y. The analog output voltages of the RC filters > would go to the analog input pins of the BX-24 and be read as analog voltages. > > In searching documents over the last 4 years, I can find no one who has done either method successfully. > There are examples of other versions of devices that have direct "Analog Outputs", that have been done. > > Best Regards, Eric > ----- Original Message ----- > From: kjellosan > To: > Sent: Monday, January 10, 2005 6:38 AM > Subject: [BasicX] BX24 & ADXL202EB analog reading > > Hi again > > Thank you for your earlier response on this topic. It helped me to > understand that my units where broken. I have now finally got the > 202EB to function using PWM. I now want to try to use it by reading > the analog signals. As I understand it is possible to have the analog > signals from Xfilt and Yfilt. > > I am a little afraid of doing this, because I have burned to > Rotomotion 2Dof Units and a 202EB, so I hope somone can help me out a > little bit. So far I have welded in place a 124K Resistor and I can > see from the Analog's schematic that I can weld in two capacitors. I > have two capacitors 0.47uF that I can put in. > > My question is which physically pins from the 202EB do I now connect > to my BX24. Do I weld a wire on to the new capacitor and in that case > which pin, or will I by adding these capacitors get analog signals > from Pin D and C ? > > [Non-text portions of this message have been removed]

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