5 genius ESP32 projects that don’t require any soldering


The ESP32 microcontroller has become hugely popular in the worlds of DIY electronics and smart home automation. You can use the small chips to build an enormous range of different things at relatively low prices. One of the biggest barriers for people dipping their toes into the world of ESP32 is the fear of having to get stuck in with a soldering iron, but there are plenty of genius ESP32 projects that don’t require any soldering at all.

A Bluetooth proxy

Make Bluetooth devices part of your smart home

The Bluetooth logo on a foggy background with boxes. Credit: Bluetooth

This is one of the easiest projects you can do with an ESP32, because it doesn’t require any additional hardware at all. You don’t need to worry about soldering when everything you need is already built into your ESP32.

Bluetooth is intended for short-range communication, and if your Bluetooth device is too far away from the device running your smart home software, it won’t be able to communicate directly. A Bluetooth proxy can communicate with your devices using Bluetooth, and with your smart home software over Wi-Fi. You can use a Bluetooth proxy to help Home Assistant communicate with supported Bluetooth devices that would otherwise be out of range.

Since both Bluetooth and Wi-Fi are already found on most ESP32 boards, all you need to do is flash ESPHome’s Bluetooth proxy firmware, and your Bluetooth proxy is ready to get to work.

Build a tiny local voice assistant

Alexa, you’re fired

A smart speaker built with the reSpeaker Lite ESP32 board. Credit: Adam Davidson / How-To Geek

Cloud-based voice assistants such as Alexa are easy to use, but they come with a lot of downsides. One of the biggest is that what you say to them gets sent to third-party servers, so you’re sacrificing your privacy for convenience.

A local voice assistant can run on your own hardware, so that nothing you say needs to leave your home. You’re also not reliant on cloud servers being up or your home’s internet connection; if your home network is still up, your local voice assistant can still function.

You can buy ready-made ESP32 development kits that have everything you need already on board. Options such as the M5Stack Atom Voice include an ESP32, an integrated microphone and speaker, a built-in speech-to-text (STT) service, and audio recording and playback, and cost as little as around $13. You can use one to set up your own local voice assistant and say goodbye to proprietary smart speakers.


The ESPHome Starter Kit from Apollo Automation on a desk.


Why ESPHome is the smart home protocol everyone is switching to (and how to get started)

Accessible to beginners with endless possibilities.

A mailbox delivery sensor

It doesn’t matter if there’s no Wi-Fi at your mailbox

A letter being posted through a mailbox. Credit: Tim Brookes / How-To Geek

While an ESP32 can work by using your home Wi-Fi for communication, it’s not the only option. You can also use ESP-NOW, Espressif’s peer-to-peer protocol that allows ESP32 devices to talk to each other wirelessly even if your home Wi-Fi is down.

One of the benefits is that you can use an ESP32 in places where your Wi-Fi signal doesn’t reach. For example, you can build a mailbox delivery sensor by connecting a contact sensor to an ESP32 and fixing it to your mailbox. The ESP32 can then communicate directly with another ESP32 in your home which can turn on an LED to indicate when mail has arrived.

If you don’t want to do any soldering, you’ll need to choose a pre-soldered ESP32 board, and a contact sensor that can connect with jumper wires or screw terminals. You should be able to find no-solder options that you can use.

An ESP32-powered device tracker

Never lose your keys or phone again

Do you regularly put your phone or keys down, only to forget where you left them? Instead of hunting around the house feeling like an idiot, you can build your own local device tracker that can tell you which room the items are currently in.

This is another useful project that doesn’t require any additional hardware at all. All you need are multiple ESP32 devices and a phone or Bluetooth tag that advertises a signal your ESP32 devices can detect. You can use the ESP32 BLE tracker component to turn your ESP32s into Bluetooth scanners that measure the signal strength from Bluetooth devices such as your phone or a Bluetooth tracker attached to your keyring. By comparing the signal strength from different ESP32s around your home, you can get a fairly accurate picture of where each device is located.

Build your own bed sensor

Perfect for morning and bedtime automations

Elevated Sensors Bed Occupancy sensor. Credit: Elevated Sensors

Morning and bedtime routines are a common part of smart homes. Having your home shut itself down for the evening by turning out the lights and shutting off devices is a great way to save yourself the effort. In the morning, another automation can start up everything you need and turn on the appropriate lights.

Getting your smart home to trigger these automations at the right time can be a challenge. A good solution is to use a bed presence sensor that can determine when you get into bed and when you get up.

You can build a bed presence sensor in various ways, including by attaching some cheap car seat occupancy sensors to an ESP32. To avoid soldering, you’ll need to use a pre-soldered ESP32 board and connect the pressure sensors using breadboard jumper cables. By adding more sensors, you may even be able to determine not just when someone is in bed, but how many people.


Don’t be scared of ESP32 projects

If you’ve never tried soldering, or your only efforts have been messy disasters, the good news is that there are plenty of ESP32 projects that don’t need any soldering at all. In some cases, you’ll need to ensure you buy the right boards and sensors to avoid soldering, but there’s a lot you can do with an ESP32 without adding any additional hardware at all.



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ZDNET’s key takeaways

  • Staff who use AI can end up with more to do, not less.
  • Think carefully about the tools you’re using and why.
  • Adopt a set of standards and refine your outputs.

The promise of productivity boosts from AI can come with an unwelcome side order of stress. Harvard Business Review found that AI doesn’t reduce work; it intensifies it, leading to cognitive fatigue and unsustainable hours.

While the common perception is that AI can help reduce workloads, allowing employees to focus more on higher-value and more engaging tasks, HBR’s research found that staff using AI worked more quickly and often ended up with more to do, not less.

Also: Forget productivity: Here are 5 strategic shifts that drive real AI value

While we’ve written about how some professionals are finding ways to turn AI’s time-saving magic into a productivity superpower, we’ve also recognized that some employees have started to become tired with the low quality of AI outputs.

Ankur Anand, group CIO at tech recruiter Harvey Nash, said professionals who want to avoid cognitive fatigue must understand how to use AI effectively and its potential risks.

“That focus will help to reduce the noise around the workload that AI creates,” he told ZDNET, suggesting that many people have unrealistic expectations about the productivity boost that AI will provide.

Also: Why I ditched Copilot for Claude in Word, Excel, and PowerPoint – and how you can, too

“Many organizations are telling their people, ‘We want to understand how you’re making an impact with AI,'” he said. “But these professionals are not empowered, which means that using AI adds a lot of pressure, because they need to prove themselves on their own terms.”

If you’re going to make the most of AI at work, then you’re going to have to find an effective balance between completing tasks quickly and producing high-quality work. 

Here’s how the experts believe professionals can ensure they reap the benefits, not the problems, of AI — and they suggest that you’ll need to focus on three core areas: tools, guidelines, and outputs.

Limit your toolset

Alex Read, senior enterprise product manager for data at energy provider EDF UK, told ZDNET that the best way for professionals to reap the benefits, not the challenges, of AI is to be uber-focused on tools that help you produce value in your roles.

While there are thousands of potential AI-enabled services on the market, Read said sensible professionals limit their horizons.

Also: How this travel company’s AI rollout drove a 73% satisfaction boost: A 5-step playbook for your business

In his own role, for example, Read focuses on how AI can help him build a data platform and update information accurately, efficiently, and productively: “Anything outside of that scope is noise for me.”

That sentiment resonated with Nick Pearson, CIO at technology specialist Ricoh Europe, who told ZDNET it’s important to take a step back and think carefully about how an AI tool can help you produce value in your role.

“If you think about the phrase ‘gen AI,’ the tech is very good, by definition, at generating outputs,” he said. “I could go to bed in the evening, set the model to work, and we could have four new IT strategies produced overnight.”

Also: Worried AI agents will replace you? 5 ways you can turn anxiety into action at work

However, quantity doesn’t necessarily mean quality. Pearson suggested it’s important to focus on AI’s blind spots, particularly as most models are trained on preexisting content.

“AI can’t inspire people, per se; it can’t naturally create something new, because it’s actually quite recursive,” he said.

“And the judgment you have to put in sometimes, on top of everything else, whether it be an ethical or a capability judgment, is not there automatically in the technology.”

It’s in this gap, said Pearson, that human experts play a critical role: “We’re toying with that concern as an organization and saying, ‘Where does AI really play an important role, versus where are we upskilling people in areas that AI probably won’t play for a long time?'”

Work to the guidelines

HBR’s research found that an initial productivity surge when AI is adopted can lead to lower-quality work, turnover, and other problems as people work harder rather than smarter.

To correct this issue, HBR said companies need to adopt an “AI practice,” or a set of norms and standards around AI use that help professionals ensure they use AI in a constrained but productive manner.

Also: 90% of AI projects fail – here are 3 ways to ensure yours doesn’t

At EDF UK, Read is part of an internal AI Center of Excellence in enterprise IT, which enables policy for the effective use of AI across the wider organization. 

In addition to Read, who contributes input from a data-use perspective, the group includes other tech representatives, such as the firm’s senior manager of AI, principal software engineer, and principal solution architect.

“The remit of this center is to make sure that, when the federated business units are looking to build, develop, and deploy AI services, they have platforms, guidance, best practices, architectural assets, and materials to guide them on how to safely and efficiently adopt AI and operationalize it at scale,” he said.

Some of the key themes the center considers when assessing AI tools are scalability and reusability, ensuring a proposed service doesn’t replicate one already in use.

Also: 5 ways to use AI when your budget is tight

“All new tools and services related to AI will go through that hopper and funnel to understand scope and ensure the security, regulatory, and ethical side of things are understood,” he said, suggesting that all professionals should use their organization’s pre-existing guidelines to foster an appropriate exploitation of emerging tech.

“The benefit that guided approach brings is that it allows us to be clear in our messaging around what AI services can be used, how they’re used from a use-case perspective, and ultimately, what personas are allowed to use them.”

Refine your outputs

Even when tools are assessed and considered acceptable, there can still be an overreliance on AI outputs. Worse, some professionals can drown in the insights they receive, leading to higher stress and fewer benefits.

Louise Newbury-Smith, head of UK&I at technology specialist Zoom, told ZDNET that one way to ensure your outputs are constrained is to focus on prompting.

“Use simple amendments to be specific, such as ‘Give me the top three things with the biggest impact.’ That approach should guide your prompt, rather than saying, ‘Give me everything you know about this topic.'”

Also: 5 ways to fortify your network against the new speed of AI attacks

Newbury-Smith said the successful use of AI is all about being smart about how it’s exploited, and that effectiveness comes down to enablement and engagement. If a prompt yields too much information, refine it until you get what you need. She said this should still be faster than trying to get answers without AI.

The basic message for professionals is that effective applications of AI are all about you staying in the loop, said Bernhard Seiser, vice president of digital, data, and IT at AOP Health.

Think before you use AI, and think again before you push your outputs around the organization.

“It doesn’t help the business if you get AI-generated emails that are many pages long, and then you need ChatGPT to summarize the text,” he told ZDNET.

Seiser said that while there are certain tasks generative AI is good at and worth using for, in the end, “you need to use your brain.”





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