Search found 17 matches

by rontec
Sun Dec 16, 2018 8:36 pm
Forum: Hardware
Topic: ESP as wireless bridge for forgetful clients
Replies: 2
Views: 2063

Re: ESP as wireless bridge for forgetful clients

There are dozens of consumer routers that can act in "station" mode to bridge a wired network to a wireless AP. Costs $15-30.
Getting one of these is much quicker and easier and cheaper (when you account for labor) than building your own.
by rontec
Sat Dec 15, 2018 9:03 pm
Forum: General Discussion
Topic: ESP32 Development Board does not power on from USB
Replies: 4
Views: 2769

Re: ESP32 Development Board does not power on from USB

It's a good habit to always order multiple parts, especially when shipping is slow, in case you get a DOA.

Have you tried programming your ESP32? There is a small chance that your LED, and not the entire board, is defective.
by rontec
Sat Dec 15, 2018 9:00 pm
Forum: General Discussion
Topic: ESP32 vs ESP8266 Radio
Replies: 4
Views: 2520

Re: ESP32 vs ESP8266 Radio

Have you considered using an ESP32 with an external antenna? External antennas are inexpensive and provide significant range boost.
by rontec
Sat Dec 15, 2018 4:58 pm
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 22939

Re: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

For example M5stack uses EA3036 Odroid-go uses MP2161 Olimex ESP32-DevKit-LiPo uses Silergy SY8089 Thanks. Very helpful. For the benefit of others: The EA3036C is under $0.15 per unit The MP2161 is under $0.10 per unit The SY8089 is under $0.09 per unit Perhaps luisonoff will be interested in analy...
by rontec
Sat Dec 15, 2018 4:36 pm
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 22939

Re: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

loboris wrote:
Fri Dec 14, 2018 10:58 am
You can use LiFePO4 battery instead of Li-ion without any LDO.
Thanks for the idea. Even a LiFePO4 battery has a voltage which is too high while it is charging.
by rontec
Fri Dec 14, 2018 7:15 am
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 22939

Re: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

There are a lot of boards that support batteries and charging and publish the schematics, check them out. Thanks. All the ones that I reviewed use LDO linear regulators. They are inefficient because of the power loss for regulation AND the relatively high required battery voltage. Do any boards tha...
by rontec
Thu Dec 13, 2018 11:17 pm
Forum: Hardware
Topic: How to power the 3.3V ESP32 from a 3.7V Li-ion battery?
Replies: 14
Views: 22939

How to power the 3.3V ESP32 from a 3.7V Li-ion battery?

The ESP32 is intended to be suitable for low power applications - in other words, running on batteries. The optimal voltage for the ESP32 is 3.3V. The nominal voltage of a Li-ion battery is 3.7V but it can be anywhere between 3V and 4.2V. Many of the development kits come with the AMS1117, which has...

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