### Initial Releases v1.0.0
1. Initial coding to support **Teensy boards, such as Teensy 2.x, Teensy LC, Teensy 3.x, Teensy 4.x, Teensy MicroMod, etc.**, using [Teensyduno core](https://www.pjrc.com/teensy/td_download.html)
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 500-1000Hz with acceptable accuracy.
* add TCA9555
* add RobTIllaart/SGP30
* Add AGS02MA
TVOC sensor - experimental library, use low speed I2C < 30 KHz, UNO does not really work as it cannot go that low.
* add MTP40C CO2 and air pressure sensor
* Add MTP40C CO2 and air pressure sensor
* Update repositories.txt
add experimental library - DAC8550
* Update repositories.txt
### Initial Releases v1.0.0
1. Initial coding to support **Arduino megaAVR boards, such as UNO WiFi Rev2, AVR_Nano_Every, etc.**, etc. using [`Arduino megaAVR core`](https://github.com/arduino/ArduinoCore-megaavr)
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 500Hz with acceptable accuracy.
### Initial Releases v1.0.0
1. Initial coding to support **AVR boards, such as Mega-2560, UNO,Nano, Leonardo, etc.**, etc. using AVR core
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 500Hz with acceptable accuracy.
### Initial Releases v1.0.0
1. Initial coding to support **nRF52-based boards, such as AdaFruit Itsy-Bitsy nRF52840, Feather nRF52840 Express**, etc. using [`Adafruit nRF52 core`](https://github.com/adafruit/Adafruit_nRF52_Arduino)
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 1000Hz with acceptable accuracy.
### Initial Releases v1.0.0
1. Initial coding to support **Nano-33-BLE or Nano-33-BLE_Sense boards** using
- [`Arduino mbed_nano core 2.5.2+`](https://github.com/arduino/ArduinoCore-mbed) for NRF52-based board using mbed_nano core such as Nano-33-BLE if you don't use `NRF_TIMER_1`.
- [`Arduino mbed core v1.3.2-`](https://github.com/arduino/ArduinoCore-mbed/releases/tag/1.3.2) for NRF52-based board using mbed-RTOS such as Nano-33-BLE if you'd like to use `NRF_TIMER_1`.
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 1000Hz with acceptable accuracy.
### Initial Releases v1.0.0
1. Initial coding to support **RP2040-based boards** such as ADAFRUIT_FEATHER_RP2040, RASPBERRY_PI_PICO, etc. using [**Earle Philhower's arduino-pico core**](https://github.com/earlephilhower/arduino-pico)
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 1000Hz with acceptable accuracy.
### Initial Releases v1.0.0
1. Initial coding to support **RP2040-based boards** such as Nano_RP2040_Connect, RASPBERRY_PI_PICO, etc. using RP2040 [**ArduinoCore-mbed mbed_nano or mbed_rp2040** core](https://github.com/arduino/ArduinoCore-mbed)
2. The hybrid ISR-based PWM channels can generate from very low (much less than 1Hz) to highest PWM frequencies up to 1000Hz with acceptable accuracy.
### Initial Releases v1.0.0
1. Initial coding to support **RP2040-based boards** such as Nano_RP2040_Connect, RASPBERRY_PI_PICO, etc. using either RP2040 [**ArduinoCore-mbed mbed_nano or mbed_rp2040** core](https://github.com/arduino/ArduinoCore-mbed) or [**Earle Philhower's arduino-pico core**](https://github.com/earlephilhower/arduino-pico)
2. The purely hardware-based PWM channel can generate from very low (lowest is 7.5Hz) to very high PWM frequencies (in the **MHz** range, up to **62.5MHz**).
1. Initial coding to support **Portenta_H7 boards** such as Portenta_H7 Rev2 ABX00042, etc., using [**ArduinoCore-mbed mbed_portenta** core](https://github.com/arduino/ArduinoCore-mbed). Max PWM frequency is limited at 1000Hz.
Non-blocking replacements for delay().
paragraph=Every will tell you _at_ every n millis(). Timer will tell you (once) when n millis() has gone by. Several convenient ways to use them. Several other variants for sequences, etc.
### Initial Releases v1.0.0
1. Initial coding to support **Portenta_H7 boards** such as Portenta_H7 Rev2 ABX00042, etc., using [**ArduinoCore-mbed mbed_portenta** core](https://github.com/arduino/ArduinoCore-mbed)
