Work on Project Ryu continues with a new model. This one will be a mid-bass by design but as always i will try to push the limits in bandwidth and sensitivity. The new cones are a bit on the heavy side weighting 18 grams but i think it will balance out very well in the mass controlled region.
The 12 inch cone has a curved profile and concentric rings to reduce breakup effects.
Voice coil was designed using my Excel spreadsheet tool. You can find a link to download it at the end of the article. Double coil, each with estimated 8 ohm impedance allowing for 4-8-16 ohm operation.
In the previous article i wrote how you could implement a software SPI communication. These days i tried this solution with a TFT touchscreen using TSC2046 driver. This will also work for ADS7843 driver.
Basically you will need to call the Get_Value_SSPI function described in the previous article. As argument if we look in datasheet of TSC2046 or ADS7843 we see we need 0xD0 for x values and 0x90 for y values.
UINT16 TS_X, TS_y;
TS_X = Get_Value_SSPI(0xD0);
TS_Y = Get_Value_SSPI(0x90);
/* TS_X, TS_Y hold the ADC values from the touchscreen driver we need to convert them to coordinates. I cut last two digits as i dont need high precision and then scaled the values to correspond to a 800×480 TFT */
I recorded a video of how it works, hope you enjoy it: