Search found 12 matches

by mura_lb
Fri Oct 11, 2024 8:50 am
Forum: General Discussion
Topic: ADC input minimum current
Replies: 4
Views: 7800

Re: ADC input minimum current

ADC input current will be neglible. However, to get the most accurate results from a high impedance source (like a high value voltage divider) you can add a small buffer capacitor (approx 100nF) between the ADC pin and ground. I have a similar problem, but not for ADC. I need to detect the generati...
by mura_lb
Mon Apr 08, 2024 6:33 am
Forum: ESP-IDF
Topic: mcpwm_set_frequency() equivalent for esp-idf v5.0
Replies: 9
Views: 7635

Re: mcpwm_set_frequency() equivalent for esp-idf v5.0

Hello Community, Does anyone have a working example of how to update the PWM frequency using the new mcpwm driver in IDF v5.0? This was simple in v4.4 using the provided mpcwm_set_frequency() function, however in IDF v5.0, mcpwm_set_frequency was removed. According to the migration documentation fr...
by mura_lb
Wed Apr 03, 2024 3:11 am
Forum: ESP-IDF
Topic: mcpwm_set_frequency() equivalent for esp-idf v5.0
Replies: 9
Views: 7635

Re: mcpwm_set_frequency() equivalent for esp-idf v5.0

ESP_morris wrote:
Wed Oct 11, 2023 8:10 am
Thanks for reporting. Yes, we will provide an API to change the period dynamically.
Whether API has been added, I found that the programming guide of 5.2.1 still does not mention setting (or adjusting) PWM operating frequency. Also, how to set up two sets of MCPWM in version 5?
by mura_lb
Thu Jul 06, 2023 3:13 am
Forum: 硬件问题讨论
Topic: 利用分压电路测量外部电压可能造成短路的疑问
Replies: 1
Views: 2071

利用分压电路测量外部电压可能造成短路的疑问

我有一个项目,需要利用分压电路测试外部电压变化。为了保护输入引脚不被大于3.3V的电压击穿。在分压电路中,会考虑添加一个嵌位二极管用以保护。

也许上电之前没有很好的审视电路的完整性,上电之后造成3V3与GND短路,再用USB接入测试,3V3引脚只有700mV的电压值。
在排除电路问题之后,我想知道这样造成的短路一般会造成哪个组件损坏,是LDO,还是芯片本身。
我用的开发板是ESP32-PICO-DevKitM-2,请问如何排查哪一部分受损。
by mura_lb
Thu Jul 06, 2023 2:36 am
Forum: 硬件问题讨论
Topic: esp32-wroom-ue模块管脚短路
Replies: 4
Views: 4338

Re: esp32-wroom-ue模块管脚短路

分压电路中需添加嵌位二极管,防止大于3.3V电压击穿34引脚。
by mura_lb
Sat May 06, 2023 8:21 am
Forum: ESP-IDF 中文讨论版
Topic: Arduino-ESP32库国内有没有镜像?
Replies: 2
Views: 2492

Arduino-ESP32库国内有没有镜像?

我想将Arduino-ESP32做成一个组件。依据文档操作 https://espressif-docs.readthedocs-hosted.com/projects/arduino-esp32/en/latest/esp-idf_component.html 但是几次github下载都失败。 发现gitee有个镜像,但是也失败 aaa@DESKTOP-QEOFLMK MINGW64 /d/Esp-Doc/ESP32-Arduino/components $ git clone https://gitee.com/mirrors/arduino-esp32.git arduino Cloni...
by mura_lb
Mon Apr 24, 2023 7:06 am
Forum: 硬件问题讨论
Topic: 请问ESP32 GPIO输入的最大电流是多少?
Replies: 0
Views: 1551

请问ESP32 GPIO输入的最大电流是多少?

我看到数据手册上是50nA,如果截取一个12V的数据,需要用到240M欧的电阻么?
by mura_lb
Thu Sep 29, 2022 12:29 pm
Forum: 硬件问题讨论
Topic: 如何恢复PICO-V3-02的出厂固件
Replies: 0
Views: 2410

如何恢复PICO-V3-02的出厂固件

官网买了一个ESP32-PICO-DevKitM-2开发板,之前做测试代码有问题,一直不断重启。 通过手动下载模式更新一个简单的基于Arduino架构代码下载到开发板上。 #include <Arduino.h> void setup() { Serial.begin(115200); } void loop() { Serial.println("This is Test!!"); delay(1500); } 但重启依旧。考虑是不是重新烧录一套AT固件,但发现PICO系列是PICO-D4的。内置Flash RAM,PSRAM和引脚都与V3-02有所不同,犹豫是否可以烧录。请给予帮助。谢谢!
by mura_lb
Fri Apr 15, 2022 3:12 am
Forum: 硬件问题讨论
Topic: Dell 灵越15如何找不到ESP32的COM端口
Replies: 2
Views: 2733

Re: Dell 灵越15如何找不到ESP32的COM端口

今天用Arduino Nano(CH340)测试,没有问题。
又改接ESP32_DevkitC_V4,成功一次,失败4次,看来是USB连接的问题。
by mura_lb
Thu Apr 14, 2022 8:07 am
Forum: 硬件问题讨论
Topic: Dell 灵越15如何找不到ESP32的COM端口
Replies: 2
Views: 2733

Re: Dell 灵越15如何找不到ESP32的COM端口

网上找了各版本的CP210X驱动,安装了都不行,FT