Search found 12 matches
- 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...
- 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...
- 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
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?ESP_morris wrote: ↑Wed Oct 11, 2023 8:10 amThanks for reporting. Yes, we will provide an API to change the period dynamically.
- 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。
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。
- 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。
- 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...
- 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?
- 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!
- 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。
又改接ESP32_DevkitC_V4,成功一次,失败4次,看来是USB连接的问题。
- 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