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Sand Clock Assembly Manual
Version 1.2 – 23 June 2017
This kit is designed for someone who has intermediate experience with assembling electronics and
mechanics.
If you believe that the kit is too complicated for your skill level please do not try to assemble it.
Take your time - it takes approximately 1 ½-2 hours to complete this kit.
Ensure your work area is well lit (daylight preferred) and clean.
Assemble the sand clock in the order as stated in the instructions - read and understand each
step before you perform each operation.
The bags with the mechanical components are numbered from 1 to 5. During assembly you will
start with bag 1 and end with bag 5. Bag numbers are indicated in the text by use of square
brackets e.g. [1].
The following tools and materials will be required to assemble the clock:
A good quality soldering iron (25-40W) with a small tip (2-3 mm).
•
Thin solder wire with no-clean flux. Do not use any flux or grease.
•
A set of pozidrive screwdrivers or a cordless screwdriver with pozidrive bits.
•
Long nose pliers.
•
Tweezers.
•
A pencil sharpener.
•
12 mm adhesive tape.
•
A computer with the Arduino IDE installed.
•
In this manual, commands are printed in bold e.g. svml 1800.
The position of a servo motor corresponds with the pulse width of the controlling PWM signal and
is expressed in microseconds (μs).
Disclaimer: All pictures are for illustration purpose only. Actual product may vary due to product
enhancement.
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Summary of Contents for Elektor SAND CLOCK
- Page 1 Take your time - it takes approximately 1 ½-2 hours to complete this kit. Ensure your work area is well lit (daylight preferred) and clean. Assemble the sand clock in the order as stated in the instructions - read and understand each step before you perform each operation.
- Page 2 When there's no valid data, which is the case when the Arduino board is used for the first time in a sand clock, the sketch drives all three servo motors in the middle position i.e. a pulse width of 1500 μs.
- Page 3 Step 11 – 12 Remove the protective film from the acrylic parts. Attach the lift servo to lift servo panel (D) using two M2x10 machine screws [3] and M2 nuts [3]. Attach the servo horn to the servo shaft using the M2.5 machine screw packed together with the servo accessories. The servo horn should point more or less upright at an angle of 90 degrees.
- Page 4 arms can rotate freely with as little slack as possible. Be gentle and do not use excessive force as the acrylic may break. Finish the assembly of the pantograph arms by attaching the servo horns. Temporarily fit an M2.5x8 machine screw [4] through the holes in the acrylic and the servo horns.
- Page 5 previously determined during step 1. You can query the correct value using sed. 8. Move the right servo motor to the horizontal position (towards 1000 μs), e.g. svmr 1080. Send this command with various values until you've determined the most accurate position.
- Page 6 Repeat until you get the desired color intensity. Make sure the sand has dried completely before you pour it in the sand box. Power on the sand clock again. The device starts up in command mode. Calibrate the pen further if necessary. The following commands draw an “8” in the sand:...
- Page 7 Congratulations, your sand clock is now finished.
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