README: add ref to async encoder driver.

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Peter Hinch 2021-06-30 10:29:07 +01:00
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@ -214,6 +214,10 @@ The [encoder_portable.py](./encoders/encoder_portable.py) version should work on
all MicroPython platforms. Tested on ESP8266. Note that interrupt latency on all MicroPython platforms. Tested on ESP8266. Note that interrupt latency on
the ESP8266 limits performance. ESP32 has similar limitations. the ESP8266 limits performance. ESP32 has similar limitations.
See also [this asynchronous driver](https://github.com/peterhinch/micropython-async/blob/master/v3/docs/DRIVERS.md#6-quadrature-encoders)
intended for control knobs based on quadrature switches like
[this Adafruit product](https://www.adafruit.com/product/377).
## 4.8 Pseudo random number generators ## 4.8 Pseudo random number generators
On the Pyboard V1.1, true random numbers may be generated rapidly with On the Pyboard V1.1, true random numbers may be generated rapidly with