address #7

[floesche]

Arduino's millis() returns an unsigned long (see https://reference.arduino.cc/reference/en/language/functions/time/millis/). When stored in elapsed or current (uint8_t) this leads to the behavior described in #7.

Also, potentially the ctx->count might overflow at some point. Resetting it to 0 whenever the condition for the modulo operator is met, will avoid this.