This was 10+ years ago and was a smaller internal project for two older machines so we didn't care they were $20 or $30 each. And the isolated digital trick is

This was 10+ years ago and was a smaller internal project for two older machines so we didn't care they were $20 or $30 each. And the isolated digital trick is used in the new industrial isolators. The neat part is since there's a micro in them they add in scaling and conditioning options which is nice.