Topsy Turvy Clock

A mantel clock with the numbers in Topsy Turvy locations. This project is a mixture of mechanics, electronics and embedded firmware. It won a prize in the Maplin Arduino competition.

Motor Chassis – Design and marking out

Motor Chassis - Design and marking out

When designing the chassis for the Topsy Turvy Clock I needed to think about how the components would fit on the brass sheet but also how I would go about marking out. Typically when dimensioning a diagram you use a

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Clock gear spacing

Clock gear spacing

After playing with the locations of the motors and gears I roughly sketched an assembly diagram with the location of the motors and shafts to allow me to estimate various part sizes. My gears were described as “27 mm Diameter

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Clock shafts

Clock shafts

Like any normal clock, the topsy turvey clocks requires two concentric spindles. The original spindle sizes were 1.6mm and 3.3mm to fit the hands. The size needed for the gear wheels I purchased was 4mm. The lengths need to be

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Real Time Clock – DS1307

Real Time Clock - DS1307

For my Topsy Turvy clock project I’ve purchased an I2C clock module based on the DS1307 Real-Time Clock chip. As mentioned this came without a battery to keep the post office happy. Although looking at the current wording of the

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More small steppers

More small steppers

The output of my stepper motor feeds into a gearbox which I’ve been told has a ratio of approximatly 64:1. During the research of this project I came across a discussion about why the gear ratios were not exact nice

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Small stepper motors

Small stepper motors

For my clock project I needed to control the position of the hands. My options were continuously rotating servos or stepper motors. I found some small 28BYJ-48 stepper motors and gearbox with ULN2003 driver boards on the internet so I

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Silly Clock

Silly Clock

Whilst watching the Mr Silly, Mr Men episode on TV, I noticed he had a rather splendidly silly clock. Research I was having a think and concluded that such a clock could be made and could also be designed to

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