December 16, 2018
Unisoc’s RDA5981 and MediaTek’s MT7697 microcontrollers (as well as variants of these two) also incorporate a WiFi radio on the chip and target low-power embeded IoT applications.
December 15, 2018
Is the RTL8710 faster at waking up and connecting to a Wifi network than the Espressif microcontrollers?
Open Network The sketch used for this test is very simple: connect to the open Wifi network, connect to a local server using TCP and send a short message, then go back to sleep.
December 13, 2018
The RealTek RTL8710 is pitched directly at the esp8266 and it even comes in an RTL-00 module that has the same pinout as an esp-12f module. How does it fare at low-power Wifi?
Experimental set-up RTLDuino with an RTL-00 Module which houses the RTL8710AF ARM Cortex-M3 Microcontroller.
December 10, 2018
Having examined the esp8266 and esp32 power consumption in detail it is time to compare the two.
December 9, 2018
With a few more hacks the esp32 light-sleep power consumption can be pushed to the limit. This post explores the limit and calculates light-sleep mode run-times.
December 4, 2018
Dynamic frequency scaling allows the esp32 to go into light-sleep mode when it is idle.
December 3, 2018
The esp32 can also maintain an association with an access point while going to sleep on its own when it is idle. Is this a good alternative to periodically waking up from deep-sleep?
December 1, 2018
Updated 2019-08-25 to include EzSBC’s ESP32-01 Breakout and Development Board
In order to test the low-power performance of the esp32 I had to acquire a few boards and I didn’t really like any of them.
November 30, 2018
Periodically waking up from deep sleep and sending a short TCP message is interesting, but how does the esp32 perform in a real scenario where it communicates with an MQTT server?
November 27, 2018
The long probing for the access point can be optimized away. In addition, it’s not smart to use open access points, so it’s time to measure the cost of security!
November 26, 2018
The esp32 is the successor of the esp8266 by Espressif. It is much faster, has two cores, more memory, more I/O, more everything. Does it also have more low-power Wifi mojo?
November 25, 2018
In automatic light-sleep mode the esp8266 goes to sleep when there is no activity. From there it can wake-up due to a timer or due to Wifi activity.
November 24, 2018
Instead of disconnecting from the AP before going to sleep and then reassociating it is also possible to maintain the association while going to sleep.
November 23, 2018
This post dives into optimizing deep-sleep with periodic wakeup on the esp8266 and ends with some calculations about expected run-time on battery.
November 22, 2018
The esp8266 can last for years on battery in deep-sleep mode, so that’s a good place to start. The question really is how often can it wake-up?
November 18, 2018
Operating Wifi at low power is difficult, Wifi is just way more complex and chatty than simple RF links. This project and blog post series explores what is available at the end of 2018.
November 11, 2018
Light barrier using pulsed IR. The transmitter is based on NE555 timers and the receiver on a special-purpose IR receiver, an stm32 for control, and an rfm69 radio to transmit interruptions.
October 6, 2018
Solar powered light barrier across a driveway to signal the entrance and departure of vehicles and pedestrians using a door chime. Communication between the light barrier and the chime is via RF links and MQTT.
July 26, 2018
Picture yourself swimming in the ocean and looking at your electronics bathing in the saltwater next to you…
July 21, 2018
I spent some time this week troubleshooting the LoRa communication problems I encountered when testing long range links from the ocean sports tracker. It led me to the SPI bus…