ESP8266 - revision history

Dank: /* PWM */

2022-11-26T07:12:46Z

PWM

← Older revision		Revision as of 07:12, 26 November 2022
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			The minimum PWM resolution is 45ns (an approximate PWM clock of 22.72MHz), supporting 14 bits of PWM resolution at 1KHz. Active PWM prevents the system from entering Deep Sleep mode, and entering Light Sleep will disrupt PWM.

			Unfortunately, the Espressif-provided PWM API only supports frequencies up to 1KHz. Libraries such as [https://github.com/StefanBruens/ESP8266_new_pwm ESP8266_new_pwm] can exceed these limitations. It ought be possible to achieve 7-bit PWM at the 25KHz required for [[PC Fans\|pc fans]].

	===ADC===		===ADC===

Dank: /* PWM */

2022-11-26T06:53:31Z

PWM

← Older revision		Revision as of 06:53, 26 November 2022
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	===PWM===		===PWM===
	* Four PWM channels on pins 10, 13, 9, and 16		Four PWM channels on pins 10, 13, 9, and 16:
	{\| class="wikitable"		{\| class="wikitable"
	! Pin name !! Pin number !! IO Function !! Name		! Pin name !! Pin number !! IO Function !! Name

Dank: /* PWM */

2022-11-26T06:53:19Z

PWM

@@ Line 13: / Line 13: @@
 ===PWM===
 * Four PWM channels on pins 10, 13, 9, and 16
 ===ADC===
 There is only one (10-bit) ADC, and it reports values between [0, 1], ''not'' [0, 3.3]. This is not a scaling--the input voltage should not exceed 1V. The NodeMCU changes this significantly:

Dank: /* Hardware */

2022-11-26T06:26:05Z

Hardware

← Older revision		Revision as of 06:26, 26 November 2022
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	==Hardware==		==Hardware==
	A Tensilica Diamond Standard 106Micro runs the Xtensa instruction set at 80MHz by default, and can be run at 160MHz. 32KB of code memory and 80KB of data are available to the user. There is no cache.		A Tensilica Diamond Standard 106Micro runs the Xtensa instruction set at 80MHz by default, and can be run at 160MHz. 32KB of code memory and 80KB of data are available to the user. There is no cache. IEEE 802.11 b/g/n support is available in AP, STA, and monitor modes.

	===GPIO===		===GPIO===

Dank: /* ADC */

2022-11-26T06:17:30Z

ADC

← Older revision		Revision as of 06:17, 26 November 2022
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	* Four PWM channels on pins 10, 13, 9, and 16		* Four PWM channels on pins 10, 13, 9, and 16
	===ADC===		===ADC===
	* There is only one (10-bit) ADC, and it reports values between [0, 1], ''not'' [0, 3.3]. This is not a scaling--the input voltage should not exceed 1V.		There is only one (10-bit) ADC, and it reports values between [0, 1], ''not'' [0, 3.3]. This is not a scaling--the input voltage should not exceed 1V. The NodeMCU changes this significantly:
	** This is not true for e.g. the NodeMCU~~, which~~ [https://www.electronicwings.com/nodemcu/nodemcu-adc-with-arduino-ide applies a divider network] to scale the 3.3V down to 1V. This allows supplying 3.3V to the external device.		* The NodeMCU [https://www.electronicwings.com/nodemcu/nodemcu-adc-with-arduino-ide applies a divider network] to scale the 3.3V down to 1V. This usefully allows supplying 3.3V to the external device.
	** On the NodeMCU, this ADC can read the battery voltage instead of a connected external device. This is set in firmware.		* On the NodeMCU, this ADC can read the battery voltage instead of a connected external device. This is set in firmware.
			* If the ADC is left unconnected, V<sub>CC</sub> can be read using <tt>ESP.getVcc()</tt>. Before calling this function, <tt>ADC_MODE(ADC_TOUT)</tt> (for external voltage) or <tt>ADC_MODE(ADC_VCC)</tt> (for system voltage) must be called.

	==External links==		==External links==

Dank: /* PWM */

2022-11-26T06:01:55Z

PWM

← Older revision		Revision as of 06:01, 26 November 2022
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	** Edge- and level-triggered interrupts available on all pins		** Edge- and level-triggered interrupts available on all pins

	==PWM==		===PWM===
	* Four PWM channels on pins 10, 13, 9, and 16		* Four PWM channels on pins 10, 13, 9, and 16
	===ADC===		===ADC===

Dank: /* GPI */

2022-11-26T06:01:48Z

GPI

← Older revision		Revision as of 06:01, 26 November 2022
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	A Tensilica Diamond Standard 106Micro runs the Xtensa instruction set at 80MHz by default, and can be run at 160MHz. 32KB of code memory and 80KB of data are available to the user. There is no cache.		A Tensilica Diamond Standard 106Micro runs the Xtensa instruction set at 80MHz by default, and can be run at 160MHz. 32KB of code memory and 80KB of data are available to the user. There is no cache.

	===~~GPI~~===		===GPIO===
	* 17 bidirectional, non-inverting, tristate GPIO pins, with input and output buffer registers.		* 17 bidirectional, non-inverting, tristate GPIO pins, with input and output buffer registers.
	** Pullup and pulldown resistors available on all pins		** Pullup and pulldown resistors available on all pins
	** Pins can be set high-impedence		** Pins can be set high-impedence
	** Edge- and level-triggered interrupts available on all pins		** Edge- and level-triggered interrupts available on all pins

	==PWM==		==PWM==
	* Four PWM channels on pins 10, 13, 9, and 16		* Four PWM channels on pins 10, 13, 9, and 16

Dank at 06:01, 26 November 2022

2022-11-26T06:01:38Z

← Older revision		Revision as of 06:01, 26 November 2022
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	A series of 32-bit microcontroller units from [https://www.espressif.com/ Espressif], followed by the [[ESP32]]. The first generation of the NodeMCU SoC was based around ESP8266.		A series of 32-bit microcontroller units from [https://www.espressif.com/ Espressif], followed by the [[ESP32]]. The first generation of the NodeMCU SoC was based around ESP8266.

	==~~Notes~~==		==Hardware==
			A Tensilica Diamond Standard 106Micro runs the Xtensa instruction set at 80MHz by default, and can be run at 160MHz. 32KB of code memory and 80KB of data are available to the user. There is no cache.

			===GPI===
			* 17 bidirectional, non-inverting, tristate GPIO pins, with input and output buffer registers.
			** Pullup and pulldown resistors available on all pins
			** Pins can be set high-impedence
			** Edge- and level-triggered interrupts available on all pins
			==PWM==
			* Four PWM channels on pins 10, 13, 9, and 16
			===ADC===
	* There is only one (10-bit) ADC, and it reports values between [0, 1], ''not'' [0, 3.3]. This is not a scaling--the input voltage should not exceed 1V.		* There is only one (10-bit) ADC, and it reports values between [0, 1], ''not'' [0, 3.3]. This is not a scaling--the input voltage should not exceed 1V.
	** This is not true for e.g. the NodeMCU, which [https://www.electronicwings.com/nodemcu/nodemcu-adc-with-arduino-ide applies a divider network] to scale the 3.3V down to 1V. This allows supplying 3.3V to the external device.		** This is not true for e.g. the NodeMCU, which [https://www.electronicwings.com/nodemcu/nodemcu-adc-with-arduino-ide applies a divider network] to scale the 3.3V down to 1V. This allows supplying 3.3V to the external device.

Dank: /* External links */

2022-11-26T05:39:24Z

External links

← Older revision		Revision as of 05:39, 26 November 2022
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	==External links==		==External links==
	* [https://en.wikipedia.org/wiki/ESP8266 ESP8266] on Wikipedia		* [https://en.wikipedia.org/wiki/ESP8266 ESP8266] on Wikipedia
	* [https://www.espressif.com/sites/default/files/documentation/esp8266-technical_reference_en.pdf ESP8266 Technical Reference]]		* [https://www.espressif.com/sites/default/files/documentation/esp8266-technical_reference_en.pdf ESP8266 Technical Reference]

	[[CATEGORY: Hardware]]		[[CATEGORY: Hardware]]

Dank: /* External links */

2022-11-26T05:39:15Z

External links

← Older revision		Revision as of 05:39, 26 November 2022
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	==External links==		==External links==
	* [https://en.wikipedia.org/wiki/ESP8266 ESP8266] on Wikipedia		* [https://en.wikipedia.org/wiki/ESP8266 ESP8266] on Wikipedia
			* [https://www.espressif.com/sites/default/files/documentation/esp8266-technical_reference_en.pdf ESP8266 Technical Reference]]

	[[CATEGORY: Hardware]]		[[CATEGORY: Hardware]]