Arduino/Raspberry Pi based Dancing Clock - Revision history

Russ hensel: /* Comment, Questions, Contributions? */

2018-01-17T00:10:13Z

Comment, Questions, Contributions?

Russ hensel at 23:03, 11 January 2018

2018-01-11T23:03:36Z

Russ hensel: /* Power Supply */

2018-01-11T21:44:46Z

Power Supply

Russ hensel: /* Compiling */

2018-01-11T21:44:20Z

Compiling

Russ hensel: /* Without the Serial Interface */

2018-01-11T21:43:57Z

Without the Serial Interface

Russ hensel: /* Download */

2018-01-11T21:43:16Z

Download

Russ hensel: /* Processor Schematic and Board */

2018-01-11T21:42:29Z

Processor Schematic and Board

Russ hensel: /* Power Supply Schematic and Board */

2018-01-11T21:41:27Z

Power Supply Schematic and Board

Russ hensel: /* Major Parts */

2018-01-11T21:39:28Z

Major Parts

Russ hensel: /* Summary */

2018-01-11T21:35:30Z

Summary

@@ Line 281: / Line 281: @@
 Email me [[russ_hensel]], or use the talk page for this topic.  All feedback is welcome.
-[[category:projects]][[category:Serial Communications]][[category:Microcontroller]][[category:PIC]]
+[[category:projects]][[category:Serial Communications]][[category:Microcontroller]] [[Category:Arduino/RaspberryPi]]
 [[category: clock]]

@@ Line 1: / Line 1: @@
 This is a rework of an earlier PIC based project, see:  [[PIC based Stepper Motor Dancing Analog Clock]]
-This is an article started by Russ Hensel, see "http://www.opencircuits.com/index.php?title=Russ_hensel#About My Articles" '''About My Articles''' for a bit of info.  The page is just begun, the project is 90% complete, it is the last 10% that kills you.
+This is an article started by Russ Hensel, see ["http://www.opencircuits.com/index.php?title=Russ_hensel#About My Articles" '''About My Articles'''] for a bit of info.  The page is just begun, the project is 90% complete, it is the last 10% that kills you.
 = next all copied from earlier article,  in process editing it =

← Older revision		Revision as of 21:44, 11 January 2018
Line 131:		Line 131:

	==== Power Supply ====		==== Power Supply ====
−
−	This is a straight forward half wave rectifier with a linear regulator. It is powered by a wall wart transformer rated at about 9 volts. The unregulated voltage is over 9 volts ( 9 * ( 2 ^ 1/2 )) by simple theory. This unregulated voltage is used directly by the steppers so choose you wall wart to match your stepper motors. You should also size the filter caps based on the current that will be used by the motors. A couple of volts of ripple is not a problem as long as you have enough overhead for the 5 volt regulator ( the PIC might run on less, let me know if you try it ). An important part of the power supply is a 60 hz, roughly square wave. It is clipped off from the AC input. The 60 Hz power line tends to be very accurate over the long term, less so if you suffer power outages. You could run the clock on batteries but the motors load down a battery pretty badly and you would need a different timing signal ( the original code has a subroutine for timing off the crystal ).

	===== Power Supply =====		===== Power Supply =====

← Older revision		Revision as of 21:44, 11 January 2018
Line 158:		Line 158:

	==== Compiling ====		==== Compiling ====
−	The zip file contains the entire source bootst project. Unzip into a directory and open in source boost. There are some additional notes at the top of the main source file. Follow the instructions there, they will tell you about any compiler and/or linker options, and report on memory usage from a recent compile of mine. The compile should run without error.
−
−	~~If you do not wish to compile you can use the precompiled hex version also included in the zip archive.~~

	=== Building the Clock ===		=== Building the Clock ===

← Older revision		Revision as of 21:43, 11 January 2018
Line 176:		Line 176:

	==== Without the Serial Interface ====		==== Without the Serial Interface ====
−
−	*Before plugging it in set the hands to 12 oclock and and 0 minutes ( if the hands are accessable, else skip this ).
−
−	*Plug in. The hands should spin a bit and then stop.
−
−	*The clock will be set to 12:00 and will immediately start running. But the hands may not be initialized or adjusted to the correct zero positions. To adjust them change the mode switch to Adj Hour Hand and manipulate the up down switch untill the hour hand moves to 12:00 ( this does not change the internal time of the clock ), switch to Adj Minute Hand and adjust it to 0 minutes.
−
−	*Switch the clock back to run, the hands may move a bit, the time is very near 12:00 ( unless it took you a long time to adjust the hands ).
−
−	*Switch to set hour to set the correct hour.
−
−	*Switch to set minute to set the correct minute.
−
−	*Switch to run and enjoy.

	==== With the Serial Interface ====		==== With the Serial Interface ====

@@ Line 294: / Line 294: @@
 === Download ===
-Note there may be a serious error in the schematic for the clock board.  You can jumper around it if you have already made the board, else wait for version X. ( may be fixed in version 2 below, but I need to check. )
+Will be at GitHub soon?
 === Comment, Questions, Contributions? ===

← Older revision		Revision as of 21:42, 11 January 2018
Line 142:		Line 142:

	===== Processor Schematic and Board =====		===== Processor Schematic and Board =====
−
−	Single sided, for toner transfer, in Eagle ( semi-final, less ground plane, files may be more up to date ) To get a readable copy download the Eagle files and open in Eagle, see: [[Techniques#Software_design_tools \| Techniques, Software Design Tools]]
−
−	~~[[Image:ProcessorBoardSch.png \| Power Supply Schematic ]]~~
−
−	~~[[Image:ProcessorBoardBrd.png \| Power Supply Board ]]~~
−
−
−	~~Parts~~
−
−	~~{\| class="wikitable"~~
−	~~\|-valign="top"~~
−	~~\|Part~~
−	~~\|Details~~
−
−	~~\|-valign="top"~~
−	~~\|Wall Wart~~
−	\|You need one with AC output to get the 60 Hz timing signal from the power line. Mine is a 9 v 800 ma unit. I found it somewhere. The output voltage, when rectified, needs to be enough to drive the motor, the PIC runs off a regulator so it does not care much about the input voltage.
−	~~<!-------------------------------->~~
−
−	~~\|-valign="top"~~
−	~~\|PIC16F877A~~
−	\|My favorate 16 series part, relatively lots of memory and pins. Bigger than you need, but only about 8 bucks. Try with an 18 series part, should not be hard and will leave you more up to date. Let me know.
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|MODE_1...MODE_6 = Rotory Switch connections~~
−	\|I used an old Radio Shack 12 position switch only 6 of them are used here. You could use seperate pushbuttons, the advantage is that the position of the rotory switch indicates which mode you are in, else you may want an led for each one, perhaps using another bunch of ports.
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|Single Pole double throw Momentry Switch~~
−	~~\|( or could be 2 momentary push buttons ) one moves the hands up, the other down, in the set and adjust modes. From my junk box.~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|Pull Up/Down Resistors~~
−	~~\|10k more or less~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|CQ1, CQ2 = capicators for the crystal~~
−	~~\|about 20 pf seems to work, see the PIC16F877A manual~~
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\|xx~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\|xx~~
−	\|
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|Q = crystal~~
−	\|4 meg Hz is what I used. May be quite a bit faster than needed, I have not looked into this. The 4 meg crystal seems to work ok on a proto board. Note that some of the code is dependent on this frequency, but could be fairly easily changed.
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|RA4, RA5 = Pull up resistors~~
−	~~\|10K more or less~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|RB1 ... RB6 = Pull up resistors~~
−	~~\|10K more or less~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|RRA2, RRA3 = Pull up resistors~~
−	~~\|10K more or less~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|C_BP = By Pass Cap.~~
−	~~\|.01 to .1 mfd mica or other by pass cap, good at high frequency seems good.~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|RRA1 = Pull Up resistor~~
−	~~\|10K more or less~~
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	\|
−	\|
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|DRIVER = Driver~~
−	\|Driver chip for stepper. ULN2803. Good for up to .5 amp 35 volts I think. Could use discrete transistors ( possibly darlingtons ) if you want higher current. You should not need more current unless you make a really big clock.
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|RMC = Pull up resistor for master clear ( pull down with push button switch to reset ).~~
−	~~\|10k more or less~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|PUSH_BUTTON_SWITCH = Reset~~
−	~~\|Push to reset the processor. Mine was from salvage.~~
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|CLOCK = Clock input signal~~
−	~~\|Connect to CLOCK_OUT on power supply.~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|VDD = Positive Power~~
−	~~\|5 volts from power supply.~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|G1 = Ground Connection~~
−	~~\|To the power supply.~~
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|SW_UP, SW_DOWN = Setting switch~~
−	~~\|I used a momentary double throw, single pole, you could use 2 momentary push buttons.~~
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!-------------------------------->~~
−	~~\|-valign="top"~~
−	~~\|MOUNT_1...4~~
−	~~\|Mounting holes.~~
−	~~<!--------------------------------~~
−	~~\|-valign="top"~~
−	~~\| =~~
−	\|
−	~~<!-------------------------------->~~
−
−	\|}

	=== Program ===		=== Program ===

@@ Line 134: / Line 134: @@
 This is a straight forward half wave rectifier with a linear regulator.  It is powered by a wall wart transformer rated at about 9 volts.  The unregulated voltage is over 9 volts ( 9 * ( 2 ^ 1/2 )) by simple theory.  This unregulated voltage is used directly by the steppers so choose you wall wart to match your stepper motors.  You should also size the filter caps based on the current that will be used by the motors.  A couple of volts of ripple is not a problem as long as you have enough overhead for the 5 volt regulator ( the PIC might run on less, let me know if you try it ).  An important part of the power supply is a 60 hz, roughly square wave.  It is clipped off from the AC input.  The 60 Hz power line tends to be very accurate over the long term, less so if you suffer power outages.  You could run the clock on batteries but the motors load down a battery pretty badly and you would need a different timing signal ( the original code has a subroutine for timing off the crystal ).
-===== Power Supply Schematic and Board =====
+===== Power Supply =====
-Single sided, for toner transfer, in Eagle ( semi-final, less ground plane, files may be more up to date )
+volt 1 amp ( better 2 amp ) wall wart and an additional regulator module to go from 12 v to 5 v
 ==== Processor Board ====

@@ Line 24: / Line 24: @@
 *2 Stepper Motors -- probably can be salvaged from printers or 5 1/4 disk drives ( where I got mine )
-*PIC16F877 processor  -- Others can be used, but this guy has a lot of IO, quite a bit is used for the clock
+* Arduino  -- mine is a nano, but pretty much anything with 8 io pins should do
-*Low side Driver Chip -- but any transistors with reasonable beta and enough current handling capacity could be substuited.
+*Low side Driver Chip -- but any transistors with reasonable beta and enough current handling capacity could be substituted.
 *Case -- With a bit more work than I have done you could have a really nice case.  I am working on an oak one now
 *Clock Face --  Some good artwork here could make a really good looking clock, anyone willing to send me an high quality graphics file?
 *Circuit Board --  Right now mine is built mostly on a proto board, but I have designed but not tested printed circuit boards suitable for single sided, toner transfer, fabrication.
 === What it Looks Like ===

@@ Line 6: / Line 6: @@
 === Summary  ===
-*Name: PIC based Stepper Motor Analog Clock with Dancing Hands
+*Name: Arduino/Raspberry Pi based Dancing Clock
 *Purpose: An amusing analog clock, see below.
-*Status: This is a draft. Code works but still in refinement, code available, email russ_hensel Also still refining the project.
+*Status: This is a draft. Code works but still in refinement, code available, email the user russ_hensel. Also still refining the project.
-*Technology: Stepper Motors, PIC 16F877A and BoostC
+*Technology: Stepper Motors, Arduino, Raspberry Pi C++ and Python
 *Author: [[russ_hensel]] ( where you can find an email address to reach me )
 *License: Open source and object code.
-This is an analog clock, with real hands driven by stepper motors.  A clock for the confused dyslexics amoung us, for more informatinon on Dyslexia see DAM ( Mothers Against  Dyslexia ). Because stepper motors are quite powerful the clock could be made quite large, 3 feet in diameter is probably within reach still using inexpensive ( salvage ) stepper motors.  The project description includes eagle files for the circuits and a BoostC project with source code for the PIC.
+This is an analog clock, with real hands driven by stepper motors.  A clock for the confused dyslexics among us, for more information on Dyslexia see DAM ( Mothers Against  Dyslexia ). Because stepper motors are quite powerful the clock could be made quite large, 3 feet in diameter is probably within reach still using inexpensive ( salvage ) stepper motors.  The project description both the hardware and the software.
 News:
-* May '09  C code was missing from archive, this has been fixed.
+* None yet,
 [[Image:ClockFace.png  | Clock Face ]]