What Have You Done To Your Tdm Today?

[jbx]

 

 true but why avoid micro programming ? I'll be detecting motion using a £1 3 axis gyro with 3 axis accelerometer, so cmos logic won't hack it anyway !

 

Also I'm modulating beetween 80% and 100% brightness at a freq of 16Hz ( the most noticeable frequency for the human eye)....so i need a bit more than cmos logic for that too. At night I'll modulate 50% - 70%

 

i think I'll try to find some Acerbis stickers, then they'll look like i spent £100 more !

 

As I said, to keep things simple and reliable.

 

Cmos are well suited for low-power and frequencies up to 5MHz, they have a nice 3 to 18 Vdd.

 

With a single 4093 you may get two gated osc at some kHz, each with a well-chosen mark-space ratio to give the right brightness, and add a third osc at 16 Hz to switch both.

 

Using a µC just to flash leds may be very fashionable but it's also overkill imho.

It's like using a raspi to display "hello world" on a tft display.

But it's everybody's choice, sometime coding is fun.

 

If you plan to use a g-sensor, be careful as they are very noisy. You'll need to implement a Kalmann filter - then you'll need a µC !

 

Actually to get the moving - non moving info i'd better use the neutral gearbox sensor which does not require any extra electronics / coding and is free from perturbations, or the speed sensor signal to get a more precise speed info.

 

With a cheap, noisy accelerometer you'll be in need for a regular null speed calibration or you'll get diverging speed figures. :good: