Adding Encoders - Revision history

Wyleu: /* Relations between these measurements */

2025-09-04T15:02:17Z

Relations between these measurements

2025-09-04T15:01:34Z

Relations between these measurements

2025-09-04T15:01:15Z

Relations between these measurements

2025-09-04T15:00:52Z

Relations between these measurements

2025-09-04T15:00:35Z

Resistance ! The Next measurement

2025-09-04T14:59:20Z

A Multimeter ?

2025-08-07T08:06:20Z

Other nefarious methods

2025-08-07T08:04:43Z

Connecting via the GPIO Pins.

2025-08-07T08:03:23Z

MCP23017 I2C Address

2025-08-07T07:26:48Z

A Multimeter ?

@@ Line 117: / Line 117: @@
-'''''V=IR''               Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
+'''''V=IR''         ----      Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
+&
-'''''W=VI''               Power (Watts) =  Voltage (Volts) * Current (Amps) '''
+'''''W=VI''        ----       Power (Watts) =  Voltage (Volts) * Current (Amps) '''

@@ Line 117: / Line 117: @@
-'''''V=IR''      Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
+'''''V=IR''               Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
+&
-'''''W=VI''     Power (Watts) =  Voltage (Volts) * Current (Amps) '''
+'''''W=VI''               Power (Watts) =  Voltage (Volts) * Current (Amps) '''

@@ Line 117: / Line 117: @@
-'''V=IR      Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
+'''''V=IR''      Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
+&
-'''W=VI     Power (Watts) =  Voltage (Volts) * Current (Amps) '''
+'''''W=VI''     Power (Watts) =  Voltage (Volts) * Current (Amps) '''

@@ Line 115: / Line 115: @@
 ====Relations between these measurements====
 '''V=IR      Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
@@ Line 121: / Line 122: @@
 '''W=VI     Power (Watts) =  Voltage (Volts) * Current (Amps) '''
 Looking at the Zynth here I'm dring it from a 12V power supply into a hifiberry Power Amp Card.

@@ Line 113: / Line 113: @@
 So in small electrical circuits we tend not to measure too much current, because it normally involves breaking a wire to perform the measurement. Measuring current consumption of a Pi can be an indicator of problems but ensuring a reliable way of actually making the measurement with a Pi & a Multimeter can get rather involved. Best measured on a Bench Power Supply. The net purchase. . .
 But I digress, The Pi acts as a resistance and using the two equations of electricity
 '''V=IR      Voltage (Volts)  =   Current(Amps) * Resistance (Ohms) '''
@@ Line 139: / Line 141: @@
 So the current = 5.64/5   = 1.128 Amps
 ====Resistance====

@@ Line 108: / Line 108: @@
 It might be tempting to simply put the meter when set to amps across the battery we measured in Volts, but this is not a good idea. A current measurement is measuring how many electrons are flowing. And if we do this with a voltage we have just measured are then we are effectively connecting the two voltages together and as much electricity as can will flow. A SHORT CIRCUIT!
-Since our the electronic we have constructed does not behave like a short circuit (Hopefully!) then there must be something limiting the current. V= IR, Resistance ! The Next measurement .
+Since our the electronic we have constructed does not behave like a short circuit (Hopefully!) then there must be something limiting the current. V= IR,
 So in small electrical circuits we tend not to measure too much current, because it normally involves breaking a wire to perform the measurement. Measuring current consumption of a Pi can be an indicator of problems but ensuring a reliable way of actually making the measurement with a Pi & a Multimeter can get rather involved. Best measured on a Bench Power Supply. The net purchase. . .

@@ Line 832: / Line 832: @@
 == Other nefarious methods==
-Other methods can be accommodated
+Other methods can be accommodated using the zynthian's inbuilt Control Device interface.
 [[File:Encoders-tight.png|thumb|4 RGB i2c Encoders and A Blue Pill STM32]]

@@ Line 536: / Line 536: @@
 === Connecting via the GPIO Pins. ===
-The raspberry Pi has a 40 pin connector that provides access to a level of connection not generally available to the PC world. This allows Digital devices to be connected to a Raspberry Pi and the Pi can both receive and transmit information to these devices as digital Data. +3.3V or 0v in electrical terms.
+The Raspberry Pi has a 40 pin connector that provides access to a level of connection not generally available to the PC world. This allows Digital devices to be connected to a Raspberry Pi and the Pi can both receive and transmit information to these devices as digital Data. +3.3V or 0v in electrical terms.
 This connector will probably exist as a standard for a considerable length of time, such is the electronic infrastructure that has grown around it. Indeed competitor boards, would dare use anything else so it's become ubiquitous, in a similar fashion to the IBM edge connectors carried on long after the company had stopped making PC's themselves.

@@ Line 516: / Line 516: @@
-ONce you have this then you can see that your MCP23017 is connected to Address A 0 . The default onfig. But you can change this if there is a conflict or your MCP23017 board has a different address set up.
+Once you have this then you can see that your MCP23017 is connected to Address A 0 . The default config. But you can change this if there is a conflict or your MCP23017 board has a different address set up.
 That's what the A0, A1 & A2 pins are for.
-Conversely, if you don't see this, then you aren't ommunicating so you will need to investigate if there is something that is preventing the 12C bus working. It could be a short circuit or a broken wire or perhaps you have got the wires in the wrong order. By enlarge it's fairly forgiving and you probably haven't damaged anything, just  . . .
+Conversely, if you don't see this, then you aren't communicating so you will need to investigate if there is something that is preventing the 12C bus working. It could be a short circuit or a broken wire or perhaps you have got the wires in the wrong order. By and large it's fairly forgiving and you probably haven't damaged anything, just  . . .
   Make Notes!!

@@ Line 96: / Line 96: @@
 ===A Multimeter ?===
 Yes, the essential first purchase after the soldering iron.
-At minimum it will measure three things
+At minimum it will measure three things.
 ====Voltage====
 The potential difference in Volts between two points.